LED

Microsensor NT

CONTENTS
Introduction2

About the company

2

Technology

3Standard product line overview

4

How it works

6

Range of applications10

Benefits of LED-PD based sensors

13

Light emitting diodes

14

Main parameters

14

Flexible pricing for 1.8 - 2.3 μm

15Main parameters

16

LED chip design17

Temperature dependences18

LED parameters at different operation modes

19

LED arrays and matrices

21

Packages

26

Photodiodes

30

Main parameters

30

Models with preamplifier

33

Photodiode chip design

34

Packages

35

Electronics

37

Overview

37

Drivers for LEDs and LED arrays38

LED driver D-41i

38

LED driver D-51i

39

mD-1c and mD-1p minidrivers

40

MCD multichannel driver41

PAb preamplifier42

SDM synchronous detector

43

Evaluation kits and systems

44

MDK/CDK and MDK-c/CDK-c

44

MDS-5/CDS-5

45

MDS-4 sensor module

46

LA-1T LED analyser

47

Contacts

48

Rev. 050716

1
HEAD OFFICE LED Microsensor NT, LLC and R&D CENTRE Microsensor Technology, LLC
10, A, Kurchatova str., 1N, St-Petersburg, 194223, Russia; info@lmsnt.com; www.lmsnt.com

LED

Microsensor NT

About the company

INTRODUCTION

LED Microsensor NT LLC is a company focused on developing and manufacturing optoelectronic devices for the mid-infrared
spectral range. The company offers a wide range of Light Emitting Diodes (LEDs), LED arrays and spectral matched Photodiodes(PDs) that cover the spectral range from 1600 to 5000 nm, optical cells and modules on their basis, related electronic devices.
Our key technology is the epitaxial growth of narrow-band-gap semiconductors based on GaSb-InAs solid solutions.
The company has a professional team of leading Russian scientists with more than 15 years’ experience in research anddevelopment of heterostructures for the mid-infrared spectral range, design of optoelectronic devices, customer guide and support.
In 2011 Rusnano Corporation made an investment in LED Microsensor NT in order to expand the production of mid-infrared
LEDs and PDs. In 2012 a spin-off R&D company Microsensor Technology LLC was arranged,
focusing within itself the intellectual capacity and the necessary basis for research anddevelopment of new products – LED arrays, optical cells and modules. The company has
become a resident of the Skolkovo Innovation Centre and carries out a number of challenging
R&D projects.
We propose our product as a new powerful base for optical absorption analysis. Oneof the greatest advantages of this method is that virtually any sample in virtually any state
may be studied: liquids, gases, films, powders and surfaces can all be examined with a properchoice of sampling technique. Using LED-PD optopairs for the mid-infrared spectral range has allowed the development of portablesensors with high reliability, fast response time and very low power consumption that can be successfully applied in different areas
for matter analysis purposes.

Standard productsLight Emitting Diodes (LEDs), Photodiodes (PDs), LED arrays

Electronic devices and sensor modules

LED driver

Synchronous detector

Methane sensor module Evaluation kits for CH4/CO2 detection

2
HEAD OFFICE LED Microsensor NT, LLC and R&D CENTRE Microsensor Technology, LLC
10, A, Kurchatova str., 1N, St-Petersburg, 194223, Russia; info@lmsnt.com; www.lmsnt.com

LED

Microsensor NT

INTRODUCTION

Technology

Our products came into existence as a result of intensive investigations in semiconductor physics. First laser heterostructuresin the world were created at the end of the 1960th in the Ioffe Physical Technical Institute by Zhores Alferov who was awarded 2000
Nobel Prize in physics for this invention.
LED and PD heterostructures are formed by sequential epitaxy of semiconductor layers on the surface of a crystal substrate.
The emission wavelength of an LED and the spectral response of a PD are determined by the energy band gap of the material usedin the active layer. Narrow band gap structure based on GaSb-InAs solid solutions enabled creation of emitters and detectors that
operate in the middle-infrared spectral range.

visible0near-infrared

middle-infrared(telecommunication)(optical gas and liquid analysis)

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

Band gap Eg, eV

Nowadays, semiconductor optoelectronic devices for visible and near-infrared spectral ranges are widely used for lighting
and telecommunications. Middle-infrared range is remarkable as many chemical agents have strong absorption bands here: CH4 ,H2O, CO2, CO, C2H2, C2H4, C2H6, CH3Cl, HCl, HOCl, HBr, H2S, HCN, NH3, NO2, SO2, glucose and many others. LEDs and PDs operating in
the range from 1600 nm to 5000 nm possess great potential for use in optical analysing systems. High interest in these components
is defined by the need of compact, cost-effective, durable sensors
2,5with very low power consumption and fast response time.
Using GaInAsSb/AlGaAsSb-based heterostructures lattice
AlAs
2matched to GaSb substrate allowed us to create LEDs and PDs for 1.6AlSb
2.4 μm spectral range; heterostructures based on InAsSb/InAsSbP1,5
GaAs
based lattice matched to InAs substrate enabled creation of LEDs and
InP
PDs for 2.7-5.0 μm spectral range. The gap from about 2.4 to 2.7 μm
1
is caused by the existence of immiscibility region for GaInAsSb-based
GaSbsolid solutions which depends on the epitaxy temperature and the
0,5
InSb
compound composition.
InAs

0
5,6

5,8

6

6,2

6,4

6,6

Lattice constsant, Å

3HEAD OFFICE LED Microsensor NT, LLC and R&D CENTRE Microsensor Technology, LLC
10, A, Kurchatova str., 1N, St-Petersburg, 194223, Russia; info@lmsnt.com; www.lmsnt.com

LED

Microsensor NT

Standard product line overview

INTRODUCTION

A line of standard LEDs (LED chip with a top contact) with peak wavelengths (μm):
NEW
1.60-1.69

1.70-1.79

1.03-1.07

1.25-1.33

1.40-1.49

1.50-1.59

Lms10LED Lms13LED Lms14LED Lms15LED
1.80-1.89

1.90-1.99

2.00-2.09

2.10-2.19

2.20-2.29

2.30-2.39

Lms16LED Lms17LED Lms18LED Lms19LED Lms20LED Lms21LED Lms22LED Lms23LED
2.70-2.79

2.83-2.90

3.30-3.44

3.30-3.44

3.45-3.52

3.53-3.69

3.70-3.75

3.60-3.94

3.95-4.09

4.10-4.30

Lms27LED

Lms28LED

Lms34LED Lms34LEDhp Lms35LED

Lms36LED

Lms37LED

Lms38LED

Lms41LED

Lms43LED

A line of LEDs with glass covering (increased output optical power up to 5 times) with peak wavelengths (μm):
3.30-3.44

3.70-3.94

4.10-4.30

Lms34LED-CG

Lms38LED-CG

Lms43LED-CG

A line of wide band photodiodes with sensitive area of Ø0.3, 0.5 and 1.0 mm and cut-off wavelengths (μm):
2.4

3.6

4.6

NEW 4.1

Lms24PD-03 Lms24PD-05 Lms24PD-10 Lms36PD-03 Lms36PD-05 Lms41PD-03 Lms41PD-05 Lms43PD-03 Lms43PD-05

A line of wide band photodiodes with glass covering (increased responsivity up to 5 times) cut-off wavelengths (μm):
3.6

4.6

Lms36PD-03-CG Lms36PD-05-CG Lms43PD-03-CG Lms43PD-05-CG

Multi-element LED matrices – a number of similar or different LED chips mounted in a single compact package and driven
together or independently.
We provide LEDs, LED arrays and photodiodes in standard TO and SMD packages (devices in customized packages could be
provided under customer's request):
TO-18

TO-18 with PR

TO-5

with/without window

TO-5 with PR

TO-8

with/without thermoelectric module

TO packages

Applied toLED, PD, LED-matrix
3.0 x 2.0 mm

LED, PD, LED-matrix
3.5 x 3.5 mm

LED-matrix

5 x 5 mm for a 3-element matrix

SMD packages

Applied toLED, PD

LED-matrix
TO-18 with glass covering

TO packages withglass covering

Applied toLED, PD

4
HEAD OFFICE LED Microsensor NT, LLC and R&D CENTRE Microsensor Technology, LLC
10, A, Kurchatova str., 1N, St-Petersburg, 194223, Russia; info@lmsnt.com; www.lmsnt.com

LED

Microsensor NT

INTRODUCTION

Standard product line overview
D-41i

D-51i

mD-1c

mD-1p

NEW MCD

LED drivers

Applied to

One element LED
PAb preamplifier

PD with a built-in preamplifier

LED-matrix
SDM

PD electronics

Applied to

PD with a built-in
preamplifierPD
CDK/CDK-c

MDK/MDK-c

MDS-4

MDS-5/ CDS-5

Evaluation kits forCO2 detection

Evaluation kits forCH4 detection

CH4 sensor module

CH4 and CO2
evaluation systems

Evaluation kits,
systems andmodules

Applied to•

LED drivers D-41i, D-51i; minidrivers mD-1c, mD-1p – unpackaged drivers that provide LED power supply in different
pulse modes; D-51i additionally enables monitoring of the LED p-n junction temperature judging by current-voltage
dependence.
• PD preamplifier PAb – converts the output current signal of a photodiode into a voltage pulse output signal withamplification. It is also available together with a PD built in a metal tube – LmsXXPD-XX-R-PA series, LmsXXPD-XX-RWPA series, LmsXXPD-XX-TEM-PA series, LmsXXPD-XX-TEM-R-PA series and LmsXX-PD-XX-CG-R-PA series;• SDM synchronous detector – measures voltage signal from the output of a photodiode preamplifier and converts itto the DC voltage signal proportional to amplitude of voltage from input, designed for operation with LmsXXPD-XX-RPA series, LmsXXPD-XX-RW-PA series, LmsXXPD-XX-TEM-PA series, LmsXXPD-XX-TEM-R-PA and LmsXX-PD-XX-CG-R-PAseries photodiodes and LEDs driven by D-41i, D-51i drivers;• Evaluation kits, systems and sensor modules:―― MDS-4 CH4 sensor module;―― MDK-c CH4 detection kit; CDK-c CO2 detection kit;―― MDK CH4 detection kit; CDK CO2 detection kit;―― MDS-5 CH4 detection system; CDS-5 CO2 detection system.

5
HEAD OFFICE LED Microsensor NT, LLC and R&D CENTRE Microsensor Technology, LLC
10, A, Kurchatova str., 1N, St-Petersburg, 194223, Russia; info@lmsnt.com; www.lmsnt.com

LED

Microsensor NT

How it works

INTRODUCTION

Infrared optical analysis is based on the vibrations of the atoms of a molecule. Infrared radiation passes through a sample
and the fraction of the incident radiation that is absorbed at a particular energy is determined. The energy at which any change in
the absorption occurs corresponds to the frequency of a vibration of a molecule that is analysed.

Principle of optical sensing based on LED – PD optopair
Several measurement schemes can be used for optical sensing depending on the exact application and conditions.

One-channel measurement scheme

measuring LED

measuring signal

measuring PD

environment with
an absorbing mattermeasuring LED

attenuated measuring signal

measuring PD

Electrical signal level, arb.u.

environment

environment without
an absorbing matterenvironment with
an absorbing mattermeasuring signal

Time, s

LED intensity/PD sensitivity, arb.u.

Basic measurement technique includes one LED and one photodiode. LED emits radiation at a specific wavelength that
corresponds to the absorption band of the analyte, spectrally-matched photodiode detects it and puts out an electrical signal.
Presence of the analyte in the environment between the LED and photodiode causes attenuation of the photodiode signal andaccording to the level of attenuation it is possible to estimate the concentration of the analyte.
LED and PD spectra for CO2 measurement
14

CO₂ absorption
Lms43LED
Lms43PD series

12
10
8
6
4
2
0
3000

3400

3800

4200

4600

5000

Wavelength, nm

Advantages:• allows designing low-cost solutions;• enables simple and compact sensor design;• provides decent results in normal conditions.
This technique is used in most of our evaluation systems and sensor modules.
Influence of temperature changing on the measured signal can be quite essential and may cause certain measurement
error. There are several ways to consider this influence:- use packages with built-in Peltier thermocooler and/or thermistor;- monitor the intrinsic LED temperature judging by LED current-voltage dependence. Our standard electronics (D-51i LED
driver and electronics used in on-board sensor modules) enable this option and puts out signals that carry information about thetemperature changing. These signals can be used for the further arranging of the temperature compensation.

Two-channel measurement scheme with one LED and two PDs (measuring and reference)
This scheme includes an additional PD apart from a measuring LED-PD optopair. The additional photodiode is a reference
one and is introduced in order to compensate influence of irrelevant effects unrelated to the analyte absorption. Measuring
photodiode provides the measuring signal sensitive to presence and concentration of analysed matter, while signal from reference
PD remains practically unaffected. Processing of measuring and reference signals allows obtaining stable and reliable measurement
results even in harsh environmental conditions thanks to the fact that photodiodes react in the same manner to the external
conditions.

6
HEAD OFFICE LED Microsensor NT, LLC and R&D CENTRE Microsensor Technology, LLC
10, A, Kurchatova str., 1N, St-Petersburg, 194223, Russia; info@lmsnt.com; www.lmsnt.com

LED

Microsensor NT

INTRODUCTION

How it works

measuring LED

reference PD(monitor)

environment without
an absorbing mattermeasuring signal

Electrical signal level, arb.u.

reference PD(monitor)

measuring PD

environment with
an absorbing matter

LED intensity/PD sensitivity, arb.u.

This scheme can be realized using 2 approaches:
a. reference (monitor) PD has the same sensitivity spectrum as the measuring PD and is deposited close to the LED, thus
ensuring the minimal signal attenuation due to short length of an optical path:environment without
an absorbing matterenvironment with
an absorbing mattermeasuring signal
reference signal

Time, smeasuring LED

attenuated measuring signal

LED and PD spectra for CO2 measurement
14

CO₂ absorption
Lms43LED
Lms43PD series

12
10
8
6
4
2
0
3000

3400

measuring PD

3800

4200

4600

5000

Wavelength, nm

b. reference PD has a spectrum insensitive to a given analyte and is deposited close to the measuring PD. This scheme should
include an LED with a spectrum broad enough to provide the emission for two photodiodes with different wavelengths - measuring
and reference or two similar photodiodes with additional optical filters to differentiate measuring and reference wavelengths.

measuring LED
measuring signal
environment with
an absorbing matter

reference PD with
an optical filter
measuring PD

environment without
an absorbing matterenvironment with
an absorbing mattermeasuring signal
reference signal

measuring LED

Time, sattenuatedmeasuring signal

reference PD with
an optical filter

LED intensity/PD sensitivity, arb.u.

measuring PD

Electrical signal level, arb.u.

environment without
an absorbing matter

LED and PD spectra for CO2 measurement

CO₂ absorption
Lms43LED
Lms43PD series
Lms43PD (filtered)

14
12
10
8
6
4
2
0
3000

3400

3800

4200

4600

5000

Wavelength, nm

Two channel measurement scheme with two LEDs (measuring and reference) and one PD
This technique includes an additional LED apart from a measuring LED-PD optopair. Measuring LED emits radiation at
wavelength corresponding to the maximum absorption of the analyte. Reference LED emits at wavelength that is not absorbedby the analyte. Signal difference between the measuring LED that is partially absorbed in the optical cell and the reference LED is
proportional to the concentration of the analyte.

reference signal

measuring PD

environment with an absorbing mattermeasuring LED

attenuated measuring signal

Electrical signal level, arb.u.

reference LED

measuring signal

environment without
an absorbing matterenvironment with
an absorbing mattermeasuring signal
reference signal

Time, smeasuring PD
reference LED

reference signal

LED intensity/PD sensitivity, arb.u.

environment without an absorbing mattermeasuring LED

LED and PD spectra for CO2 measurement

CO₂ absorption
Lms43LED
Lms43PD series
Lms38LED

14
12
10
8
6
4
2
0
3000

3400

3800

4200

4600

5000

Wavelength, nm

7
HEAD OFFICE LED Microsensor NT, LLC and R&D CENTRE Microsensor Technology, LLC
10, A, Kurchatova str., 1N, St-Petersburg, 194223, Russia; info@lmsnt.com; www.lmsnt.com

LED

Microsensor NT

How it works

INTRODUCTION

2-channel measurement scheme with 2 LEDs (measuring and reference) and 2 PDs (measuring andreference)
This approach is similar to the previous one with the only difference that additional photodiode is introduced for reference
signal detection. The overall scheme includes 2 independent channels: measuring LED-PD optopair (corresponds to the absorption
wavelength(s) of the analyte) and reference LED-PD optopair (operates at wavelength(s) away from the analyte absorption).
Concentration of the analyte is defined by the signal difference between the measuring and reference PDs.
Common advantages of 2-channel schemes:• enable compensation of the effects unrelated to the analyte absorption;• provide better stability of the measurement results comparing to the 1-channel scheme;• require less frequent calibration than systems based on 1-channel measurement scheme.

environment without an absorbing mattermeasuring PD

measuring signal

reference signal

reference LED

reference PD

environment with an absorbing mattermeasuring LED

attenuated measuring signal

measuring PD

Electrical signal level, arb.u.

measuring LED

environment without
an absorbing matterenvironment with
an absorbing mattermeasuring signal
reference signal

Time, s

LED intensity/PD sensitivity, arb.u.

reference LED

reference PD

reference signal

LED and PD spectra for CO2 measurement141210
CO₂ absorption8

Lms43LED
Lms43PD series

6

Lms36PD series4

Lms34LED

2
0
2000

2400

2800

3200

3600

4000

4400

4800

Wavelength, nm

8HEAD OFFICE LED Microsensor NT, LLC and R&D CENTRE Microsensor Technology, LLC
10, A, Kurchatova str., 1N, St-Petersburg, 194223, Russia; info@lmsnt.com; www.lmsnt.com

LED

Microsensor NT

INTRODUCTION

Range of applications

Range of applications
Control of technological processes, examples:- paper industry (water in paper control);- oil and petroleum industry (detection of water
concentration in oil and oil products);- thickness testing (thickness of plastic, glass bottles);- pharmaceutical industry.
Medical diagnostics, examples:- out-breath control (measurement of carbone
dioxide, acetone concentration);- non-invasive control of glucose in blood, urine;- cholesterol control.

Ecological monitoring, examples:- control of carbon dioxide, carbon monoxide,
exhaust gases in the atmosphere;- control of methane, propane leakage;- control of hydrocarbons in water.
Food industry and agriculture, examples:- control of water, fiber, protein concentration in
grains, humidity control of coffee beans, corn;- control of fat and protein in milk.

Spectra are characteristics of the molecules. Frequency of the fundamental vibrations varies with the atomic weight of theconstituents. Further spectra exist due to overtones. These are in general much weaker, but there are still possibilities for these
to be used for measurement purposes. The absorption strengths also vary with different molecules and therefore, different path
lengths should be provided in order to obtain adequate absorption in the required sensitivity range. Small measuring cells canbe advantageous, notably when a rapid response is needed. Optical cells that enable multiple pass or long pass of the emission
through the analyte can be used for detection of very small concentrations.
There are strong absorption bands of many chemical agents in the mid-infrared spectral range that allows their detection
with sensor devices based on LED-PD optopairs or using LED Microsensor NT photodiodes in combination with other sources ofinfrared radiation. Some of these chemical agents and their absorption bands are presented here.

ButaneFormic acid
EthaneFormaldehyde
Carbon monoxide
PropaneGlucoseMethaneCarbon dioxide
Water

C4H 10
HCOOH
C2H 6
H2CO
CO
C3H 8
C6H 12O6
CH 4
CO 2
H2O
1500

2000

2500

3000

3500

4000

4500

5000

Wavelength, nm

9HEAD OFFICE LED Microsensor NT, LLC and R&D CENTRE Microsensor Technology, LLC
10, A, Kurchatova str., 1N, St-Petersburg, 194223, Russia; info@lmsnt.com; www.lmsnt.com

LED

Microsensor NT

Range of applications

INTRODUCTION

Methane detection

CH4 absorption spectrum
1,2

Absorption intensity, a.u.

Methane has the main absorption band at 3200-3450 nm.
Weaker absorption bands are located around 2300 nm and 1650 nm(the data are taken from HITRAN Catalogue).
0,8
For the development of compact optical cells or detection of
0,6
small methane concentrations we recommend using: Lms34LED and
0,4
Lms36PD photodiode series. In case of two-channel measurement
scheme it is preferable to use a combination of Lms38LED and Lms43PD
0,2photodiode series for the reference channel.
0
For the systems with a long optical path or detection of high
1500
2000
2500
3000
3500
4000
Wavelength, nm
methane concentrations the pair: Lms23LED and Lms24PD photodiodeseries could be used. In case of arranging a two-channel measurement
scheme we recommend using Lms20LED and Lms24PD photodiode series for the reference channel.
1

Carbon dioxide detection
CO2 absorption spectrum

Carbon Dioxide has a strong absorption band at 4200-4320 nm
spectral range and weaker bands around 2700 nm and 2000 nm (the1data are taken from HITRAN Catalogue).
0,8
For the development of compact optical cells or detection of
0,6
small carbon dioxide concentrations we recommend using: Lms43LED
and Lms43PD photodiode series. In case of two channel measurement
0,4
scheme it is preferable to use a combination of Lms38LED and Lms43PD
0,2photodiode series for the reference channel.
0
For the systems with a long optical path or detection of high carbon
2000
2500
3000
3500
4000
4500
5000
5500
dioxide concentrations the pair: Lms20LED and Lms24PD photodiodeWavelength. nm
series could be used. For two-channel scheme we recommend using
Lms23LED with Lms24PD photodiode series as a reference optopair.
Carbon dioxide detection at ~2700 nm is quite complicated due to the strong water absorption in the same spectral region.

Absorption intensity, a. u.

1,2Water detection
H2O absorption spectrum

Water has strong absorption bands at spectral ranges 2550-2800
nm and 1830-1940 nm (the data are taken from HITRAN Catalog).
We recommend using Lms19LED and Lms24PD photodiodeseries. In case of two-channel measurement scheme Lms16LED and
Lms24PD photodiode series could be used for the reference channel.

Absorption intensity, a.u.

1,2
1
0,8
0,6
0,4
0,2
0
1700

1900

2100

2300

2500

2700

2900

3100

Wavelength, nm

10HEAD OFFICE LED Microsensor NT, LLC and R&D CENTRE Microsensor Technology, LLC
10, A, Kurchatova str., 1N, St-Petersburg, 194223, Russia; info@lmsnt.com; www.lmsnt.com

LED

Microsensor NT

INTRODUCTION

Range of application

Many different substances have absorption bands in the middle infrared range, but most of analysis and detection tasks are
related with measuring only few compounds – water, carbon dioxide, methane and other hydrocarbons:СH4 and otherhydrocarbon
sensors•••••

CO2 sensors

H2O sensors

gas industry: natural gas leakage control;
metallurgy: methane concentration control, respective ventilation regulation;
plastic industry: monitoring of plastic bottles thickness and composition;
medical diagnostics: control of fat and other organics in the blood, lymph,
tissues;
waste recycling: methane concentration control at landfills.

•
•
•
•
•
•

monitoring: CO2 control on the streets and in the buildings;
agriculture: CO2 control in greenhouses;
construction: CO2 control for welding works;
mining: measurement of CO2 levels in the mines, respective ventilation control;
medical equipment: CO2 breath control (as an element of capnograph);automotive industry: exhaust gas control and monitoring of combustion
processes inside the engine;

•
•
•
•
•
•

oil & gas: oil quality control, water in oil analysing;
agriculture: measuring of crops and soil moisture level;
textile industry: humidity measurement of different textile fabrics;
food and beverages: fryers and roasters tuning;
tobacco production: humidity control of dried leaves;space and aviation: humidity control at high altitudes to assess the degree oficing of the aircraft.

11
HEAD OFFICE LED Microsensor NT, LLC and R&D CENTRE Microsensor Technology, LLC
10, A, Kurchatova str., 1N, St-Petersburg, 194223, Russia; info@lmsnt.com; www.lmsnt.com

LED

Microsensor NT

Range of applications

INTRODUCTION

Wireless stand-alone detectors with low power consumption
Wireless technologies allow creation of stand-alone devices for environmental monitoring, industrial safety, medical
usage etc. LEDs and photodiodes are the ideal components to be implemented in such systems due to their extremely low power
consumption, fast response and long lifetime. We are glad to announce development of the first LED-PD based sensor family witha battery power supply and integrated wireless data transmission module. First prototype – MDS-4D – is oriented for methane
detection and can be applied for solving different tasks, e.g.:• methane concentration control in the natural gas, oil extraction fields, coal mines, biogas production plants;• gas concentration monitoring along the pipelines, local gas networks, on the territory of petroleum oil refineries andnatural gas processing plants, waste landfill sites;• methane emissions control in household and industrial applications, where natural gas is used as an energy source;• methane leakage monitoring in the gas filling stations and vehicles running on gas fuel;• methane emissions control of agricultural objects (pastures, biomass storages).
Main MDS-4 module features:
99 diffusion type detection;
99 measurement in 0-5% (volume) concentration range;
99 resolution down to 250 ppm in 0-5% (volume) concentration range;
99 very low power consumption – 3.5 mW;
99 quick response time – <2 s;
99 operating temperature range – 0..+40°C;
99 size: 55 x 26 x 14 mm (including optical cell and circuitry);
99 gases: precalibrated for methane, but will respond to most hydrocarbons.

MDS-4 sensor module

MDS-4D sensor

12
HEAD OFFICE LED Microsensor NT, LLC and R&D CENTRE Microsensor Technology, LLC
10, A, Kurchatova str., 1N, St-Petersburg, 194223, Russia; info@lmsnt.com; www.lmsnt.com

LED

Microsensor NT

INTRODUCTION

Benefits of LED - PD based sensors

The major rivals to infrared sensors are electro-chemical devices and semiconductor surface effect sensors, both of which
can have very low unit cost compared with the present infrared offerings but have disadvantages in selectivity, fail-to safety, etc.
There is a growing trend towards the use of infrared technology.
Present infrared absorption technology utilises several types of emission sources:- broad-band light sources – filament black body emitters, planar filaments in thin technology – used together with crude
and simple optics such as light pipes followed by filters, provide low modulation range (~8 Hz), less suitable for miniaturized
sensing devices, low-cost;- narrow-band sources – laser sources – lead-salt lasers (PbSnSe, PbSSe material systems) with wavelengths up to 14 μm andpeak power in the Watt range in continuous wave (CW) mode, require elaborate cooling, frequently cryo cooling; quantum cascadelasers with Bragg feedback gratings (based on GaAs/AlGaAs, GaInAs/AlInAs material systems) allow currently CW-power in theMilliwatt range. Lasers enables detection with very high resolution, distinguishing different absorption lines, but require accurate
frequent tuning of the laser wavelength and precise temperature stabilization and have high cost.
For many applications there is no need to distinguish each absorption line and a group of lines (bands) can be used. New
optoelectronic devices for the middle infrared spectral range provide completely new possibilities for the creation of portablesensors creation. Using mid-infrared LED-PD optopairs has allowed the development of an instrument that is smaller, less expensive,and more versatile in functionality.

Main advantages that mid IR LEDs and PDs bring for optical sensing:99 Low power
consumption
99 Compact size
99 Low cost

99 Long lifetime
99 No need in frequentcalibration

Ability to design autonomous
wireless sensors (remote control
systems)

Saving budgetary on system
maintenance (DCV, HVAC systems)

99 Short response time

99 Multi-element LED
designAbility to analyze objects moving
at high speed (paper and plastic
fabrication process)

Ability to arrange multi-wavelength
emitters and very compact costeffective LED spectrometers on their
basis

13
HEAD OFFICE LED Microsensor NT, LLC and R&D CENTRE Microsensor Technology, LLC
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LED

Microsensor NT

Main parameters

LIGHT EMITTING DIODESLight Emitting Diodes for 1.0 - 2.3 μm spectral range
LED emission (qCW, current 200 mA)
1,2Normalized intensity, a.u.

Lms10LED1

Lms13LED
Lms14LED

0,8

Lms15LED
Lms16LED

0,6

Lms17LED
Lms18LED

0,4

Lms19LED
0,2

Lms20LED

01000

Lms21LED
1200

1400

1600

1800

2000

2200

2400

2600

Lms22LED
Lms23LED

Wavelength, nmStandard LED models - Lms MIR LED (1.0 – 2.3 µm)

ModelPower, mW

Peak emission FWHM of the
wavelength, emission band,µm
nm

QCW mode*1(200 mA)

Pulse mode*2
(1 A)

min

max

min

max

min

max

min

max

Voltage, V(200 mA)

Operatingtemperature
range, °C

QCW mode*1 Pulse mode*2

NEW
NEW
NEW

Lms10LED

1.03

1.07

70

100

12

20

30

40

Lms13LED

1.25

1.33

70

100

10

18

25

35

0.9-1.2

Lms14LED

1.40

1.49

90

120

7

15

20

25

0.8-1.1

NEW

Lms15LED

1.50

1.59

110

140

7

15

20

25

0.8-1.1

Lms16LED

1.60

1.69

120

150

7

15

20

25

0.7-1.1

Lms17LED
Lms18LED
Lms19LED

1.70
1.80
1.90

1.76
1.89
1.99

160
100
100

220
200
200

5
0.7
0.8

10
1.1
1.2

15
4.5
5

20
6.5
7

0.7-1.1
0.5-2.5
0.5-2.5

Lms20LED

2.00

2.09

150

250

0.8

1.2

5

7

0.5-2.5

Lms21LED

2.10

2.19

150

250

0.8

1.2

5

7

0.5-2.5

Lms22LED

2.20

2.29

150

250

0.8

1.2

5

7

0.5-2.5

Lms23LED

2.30

2.39

170

270

0.6

1.0

4

6

0.5-2.5*1

Maximum operating
current, mA

1.1-1.4

200

1000

from -60 to +90

250

2000

Repetition rate: 0.5 kHz, pulse duration: 1 ms, duty cycle: 50%
Repetition rate: 0.5 kHz, pulse duration: 20 μs, duty cycle: 1%*2

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LED

Microsensor NT

LIGHT EMITTING DIODES

Flexible pricing for 1.8 - 2.3 μm LEDs

For the applications that don’t require high optical power we offer LED models with flexible pricing, so you can order LEDs
with lower power for significantly lower prices:Standard LED models – Lms MIR LED (1.8 – 2.3 μm)
Model

Lms18LED

Lms19LED

Lms20LED

Lms21LED

Lms22LED

Lms23LED

Power, mW

Peak emission wavelength, µm

QCW mode*

Category

Price Discount

min

max

min
0.7

1.1

A

standard

1.80

1.89

0.5

0.69

B

-40%

0.3

0.49

C

-70%

1.90

2.00

2.10

2.20

2.30

1.99

2.09

2.19

2.29

2.39

*

max

0.8

1.2

A

standard

0.6

0.79

B

-40%

0.3

0.59

C

-70%

0.8

1.2

A

standard

0.6

0.79

B

-40%

0.3

0.59

C

-70%

0.8

1.2

A

standard

0.6

0.79

B

-40%

0.3

0.59

C

-70%

0.8

1.2

A

standard

0.6

0.79

B

-40%

0.3

0.59

C

-70%

0.6

1.0

A

standard

0.45

0.59

B

-40%

0.3

0.44

C

-70%

Repetition rate: 0.5 kHz, pulse duration: 1 ms, duty cycle: 50%, current: 200 mА

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LED

Microsensor NT

Main parameters

LIGHT EMITTING DIODESLight Emitting Diodes for 2.7 - 5.0 μm spectral range
LED emission (qCW, current 200 mA)
Normalized intensity, a.u.

1,21

Lms27LED
Lms28LED

0,8

Lms34LED
0,6

Lms35LED
Lms36LED

0,4

Lms37LED
Lms38LED

0,2

Lms41LED

02000

Lms43LED
2500

3000

3500

4000

4500

5000

Wavelength, nmStandard LED models – Lms MIR LED (2.7 – 4.3 µm)

ModelPower, μW

Peak emission FWHM of the
wavelength, emission band,µm
nm

QCW mode*1(200 mA)

Pulse mode*2
(1 A)

min

max

min

max

min

max

min

max

Voltage, V(200 mA)

Operatingtemperature
range, °C

QCW mode*1 Pulse mode*2

NEW

Lms27LED

2.70

2.79

300

500

12

25

100

180

0.2-1.0

NEW

Lms28LED

2.83

2.90

300

500

20

40

150

300

0.2-1.0

Lms34LED

3.30

3.44

250

600

20

45

150

350

0.2-1.3

NEW

Lms34LEDhp

3.30

3.44

250

600

45

80

350

500

0.2-0.8

NEW

Lms35LED

3.45

3.52

300

600

20

40

150

300

0.2-0.8

Lms36LED

3.53

3.69

300

600

15

40

120

300

0.2-0.8

Lms37LED

3.70

3.75

300

600

12

30

100

150

0.2-0.8

Lms38LED

3.76

3.94

400

700

12

30

100

150

0.2-0.8

Lms41LED

3.95

4.09

400

1200

12

30

100

200

0.2-0.8

Lms43LED

4.10

4.30

400

Lms34LED-CG

3.30

3.44

250

600

80

-

500

-

0.2-1.3

Lms38LED-CG

3.70

3.94

500

700

45

-

300

-

0.2-0.8

Lms43LED-CG

4.05

4.30

600

1200

25

-

150

-

0.2-0.8

NEW

Maximum operating
current, mA

250

2000

from -60 to +90

1000

from 0 to +50

1200
15
50
120
370
0.2-0.8
LED models with a glass cover – Lms MIR LED-CG (3.4 – 4.3 µm)

*1

250

Repetition rate: 0.5 kHz, pulse duration: 1 ms, duty cycle: 50%
Repetition rate: 0.5 kHz, pulse duration: 20 μs, duty cycle: 1%*2

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HEAD OFFICE LED Microsensor NT, LLC and R&D CENTRE Microsensor Technology, LLC
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LED

Microsensor NT

LIGHT EMITTING DIODES

LED chip designStandard Mid Infrared LED chipemittingarea

ring contact –200/230 µm

200…250 µm

350…400 µm
contact

This shape of LED chip is typical for most of LED Microsensor NT standard LED models (Lms XX LED series).
Main features are:• small size of the LED chip (close to point source);• effective heat dissipation from the active layer;• uniform current distribution in the active region;• cost effective (due to small size).

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HEAD OFFICE LED Microsensor NT, LLC and R&D CENTRE Microsensor Technology, LLC
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LED

Microsensor NT

Temperature dependences

LIGHT EMITTING DIODES

Temperature dependences of optical characteristics
It is typical for all semiconductor radiation sources to have intensity decreasing with temperature increase. This decreaseof the emission intensity is related to several temperature-dependent factors, including non-radiative recombination via deeplevels, surface recombination and carrier loss over heterostructure barriers. In addition to this, peak wavelength shifts to longer
wavelengths when the temperature rises.
We can offer several ways to control LED temperature:
Lms34LED-TEM series (qCW mode)

Lms22LED-TEM series (qCW mode)
350

90

2°С
300

Intensity, a.u.

Intensity, a.u.

24°С

70

56°С

250

2°С

80

24°С

200
150
100
50

51°С

60
50
40
30
20
10

0
1700

1800

1900

2000

2100

2200

2300

2400

2500

0
2500

2600

2700

Wavelength, nm

2900

3100

3300

3500

3700

3900

4100

Wavelength, nm•

Mounting of an LED chip into a package with a thermoelectric module (Peltier element) enables stabilization of thetemperature of an LED chip, providing wavelength tuning in a certain wavelength range.
• Monitoring the intrinsic LED temperature judging by the LED current-voltage dependence:
short current pulse is applied and corresponding voltage is measured, this voltage value depends on LED (p-n) junction
temperature. Temperature compensation scheme can be further arranged considering this dependence. This option isprovided by D-51i LED driver produced by LMS NT (see section Electronics of the Catalogue and/or manual for D-51i LED
driver).
Our LEDs can operate in a wide temperature range, which certainly broadens their field of application. As an example,
Lms43LED spectra at 1 - 120°C temperature range are presented below.

Intensity, a.u.

20
15
CO2 absorption
10
5
0
2800

110 °C
100 °C
90 °C
80 °C
70 °C
60 °C
50 °C
40 °C
30 °C
22 °C
10 °C
1 °C

Optical power vs temperature for Lms43LED
25
20

Optical power, a.u.

25

Temperature dependence of LED intensityof Lms43LED
120 °C

15
10
5
0

3300

3800

4300

Wavelength, nm

4800

5300

0

20

40

60

80

Temperature, °С18HEAD OFFICE LED Microsensor NT, LLC and R&D CENTRE Microsensor Technology, LLC
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100

120

LED

Microsensor NT

LIGHT EMITTING DIODES

LED parameters at different operation modes

LEDs offer numerous benefits due to the possibility for different operational modes. The optical parameters of LED strongly
depend on the operational regime that you choose. We recommend using pulse modes with duty cycle 50% (quasi-continuous
wave mode) or 25% to receive maximum average power. These modes provide signal modulation at a certain frequency and allow
higher output intensity to be obtained than is the case when using hard CW (continuous wave) mode; therefore, hard CW mode is
not recommended. To obtain the maximum peak optical power we recommend using short pulse modes (less than 50 μs).

Drive current

Quasi-continuous wave (quasi-CW) mode:
31-1000 μs 31-1000 μs

max. 0.25 A

f = 0.5 - 16 kHzTimeSpectra at different currents in the quasi-CW mode (frequency 0.5 kHz, duty cycle 50%):
Lms34LED

Lms22LED

350

120

50 mA
100 mA300

150 mA
200 mA
220 mA

200
150
100

Intensity, a.u.

Intensity, a.u.

250

20 mA
50 mA
100 mA
150 mA
200 mA
220 mA

100
80
60
40
20

50
0
1600

1800

2000

2200

2400

0
2500

2600

2700

Wavelength, nm

2900

3100

3300

3500

3700

3900

Wavelength, nm

Power dependence on current in the quasi-CW mode (frequency 0.5 kHz, duty cycle 50%):
Lms34LED
80

1,4

70

1,2

60

Optical power, µW

Optical power, mW

Lms22LED
1,6

1
0,8
0,6
0,4

50
40
30
20
10

0,2

0

0
0

50

100

150

Current, mA

200

250

0

50

100

150

200

250

Current, mA

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HEAD OFFICE LED Microsensor NT, LLC and R&D CENTRE Microsensor Technology, LLC
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LED

Microsensor NT

LED parameters at different operation modes

LIGHT EMITTING DIODESHigh peak optical power can be achieved at operation mode with short current pulses.

Pulse mode:

Drive current

2-20 μs

62 - 2000 μs
max. 2 A
f = 0.5 - 16 kHz

Time

Radiation spectra at different currents in the pulse mode:(pulse 2 us, frequency 8kHz)
Lms22LED
260 mA

6

5

166 mA244 mA
360 mA
480 mA
610 mA730 mA970 mA
1220 mA
1460 mA
1950 mA
2440 mA
2920 mA
3660 mA
4880 mA

0
2500

2700

35

488 mA

4

760 mA

30

1000 mA

25

Intensity, a.u.

5

Intensity, a.u.

Lms34LED40

71260 mA
1510 mA

3

1760 mA
2000 mA

2

20
15
10

2488 mA

1
0
1700

1800

1900

2000

2100

2200

2300

2400

2500

2900

3100

3300

3500

3700

3900

4100

Wavelength, nm

Wavelength, nm

Optical power dependence on the drive current in the pulse mode:
Lms22LED

Lms34LED
1600

70
0.5 kHz 20 µs
0.5 kHz 2 µs

50

0.5 kHz 0.8 µs

40

0.5 kHz 20 µs

1400

0.5 kHz 10 µs

Peak power, µW

Peak power, mW

60

30
20
10

0.5 kHz 10 µs

1200

0.5 kHz 2 µs

1000

0.5 kHz 0.8 µs

800
600
400
200

0

0
0,0

0,5

1,0

Current, A

1,5

2,0

0,0

0,5

1,0

Current, A

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1,5

2,0

LED

Microsensor NT

LIGHT EMITTING DIODES

LED parameters at different operation modes

Power dependence on the duty cycle (duty cycle = pulse duration/pulse period):
Lms34LED (f = 0.5 kHz, I = 2 A)

Lms22LED (f = 0.5 kHz, I = 2 A)
80

1900

75

1800

70

1700

Peak power, µW

Peak power, mW

65
60
55
50
45
40

1600
1500
1400
1300
1200
1100

35
30

1000
0,01

0,1

1

0,01

0,1

Duty cycle, %1

Duty cycle, %Power dependence on current in the pulse mode (pulse duration 8 μs, repetition rate 2 kHz):Lms22LED25

1,2

Peak power, µW

20Peak power, mW

Lms34LED

1,4

15
10
5

1
0,8
0,6
0,4
0,2

0
0

500

1000

1500

2000

2500

0
0

500

1000

Current, mA

1500

2000

2500

Current, mA

Pulse operation mode provides not only high peak optical power but also helps to decrease power consumption essentially.
For example, LED with 3.4 μm peak wavelength is driven at pulse mode:• current amplitude 1 A;
• pulse duration 1 μs;• frequency 1 kHz (period 1 ms);
• LED forward voltage at 1 A is about 0.5 V.
Average power consumption during pulse period: 1 A x 0.5 V x 1 μs / 1000 μs = 0.5 mW. Further decrease of power
consumption up to 0.05 mW can be achieved by applying packets of pulses: 100 pulses in a packet, duration of one packet – 0.1 s,pause between packets - 0.9 s.
0.1 s

1000 μs
1A

Time

Drive current

Drive current

1 μs

1s
1A

Time

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LED

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LED arrays and matrices

LIGHT EMITTING DIODES

Tiny size of an LED chip (0.4 × 0.4 mm), narrow-band emission
spectrum, short response time and low thermal flux enables creation of very
compact multi-element LED arrays and matrices emitting at one or different
wavelengths.
Parallel connection of several LED chips that emit at the same
wavelength and driving them together can provide significant increase of total
optical power.
Connecting LED chips that emit at different wavelengths and driving
them independently, or applying short current pulses sequentially to each chip, enables scanning of a certain spectral range withthe help of a very compact radiation source.
Currently we offer two standard LED matrix types - 4-element one-wavelength arrays and 6-elements multi-wavelength
array.

Standard 4-element one-wavelength LED arrays
4-element LED matrix with one peak wavelength at 3.4 µm or 4.3 µm.
Standard one-wavelength LED matrix models
Peak emission FWHM of thePower, μW
Maximum operating
Voltage
wavelength, emission band,current, mA
QCW mode*1
Pulse mode*2 per chip, Vµmnm(200 mA)
min
max
min
max
min
max
min
max
QCW mode Pulse mode

Model
Lms34LED-4M

3.30

3.44

250

600

70

200

500

1300

0.2-1.3

Lms43LED-4M

4.10

4.30

700

1000

50

150

400

1000

0.2-0.8

*1

1000

8000

Operatingtemperature
range, °C
from -60 to +90

Repetition rate: 0.5 kHz, pulse duration: 1 ms, duty cycle: 50%, current: 800 mA.
*2
Repetition rate: 2 kHz, pulse duration: 0.5 μs, duty cycle: 0.1%, current: 4 А.

These arrays are available in the following packages:
TO-18 with a cap (without a glass window) or reflector (with/without a glass window) - models: LmsXXLED-4M, LmsXXLED4M-R and LmsXXLED-4M-RW;
TO-5 with a thermoelectric module with a cap (with a glass window) or reflector (with a glass window) - models:
LmsXXLED-4M-TEM, LmsXXLED-4M-TEM-R.

Output intensity of the 4-element arrays
Lms43LED-4M

Lms34LED-4M
50

200

Intensity, a.u.

160
140

45

Lms34LED40

4-element matrix
Lms34LED-4M

Intensity, a.u.

180

120
100
80
60

35
25
20
15
10

20

5

2800

3000

3200

3400

Wavelength, nm

3600

3800

4000

CO2 absorption

4-element matrix
Lms43LED-4M

30

40
0
2600

Lms43LED

0
2800

3200

3600

4000

4400

Wavelength, nm

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HEAD OFFICE LED Microsensor NT, LLC and R&D CENTRE Microsensor Technology, LLC
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4800

5200

LED

Microsensor NT

LIGHT EMITTING DIODES

LED arrays and matrices

Power dependence on current in the QCW mode (frequency 0.5 kHz, duty cycle 50%)
Lms43LED-4M
80

Optical power, µW

70Single LED

60

4-element
matrix

50
40
30
20
10
0
0

50

100

150

200

Current, mA

Lms13-14-16-17-19-21LED-6M 6-element multi-wavelength LED array*
Main LED chip parameters
LED chip #Peak emission
wavelength, µm

FWHM of theemission band, nm

Power, mW
QCW mode*1

Pulse mode*2

Voltage, V(200 mA)

min

max

min

max

min

max

min

max

min

max

Lms13LED

1.25

1.33

70

100

8

10

25

35

0.9

1.2

Lms14LED

1.40

1.49

90

120

7

9

20

25

0.8

1.1

Lms16LED

1.60

1.69

120

150

6

8

20

25

0.7

1.1

Lms17LED

1.70

1.79

160

220

5.5

7.5

15

20

0.7

1.1

Lms19LED

1.90

1.99

100

200

0.8

1.2

5

7

0.8

1.2

Lms21LED

2.10

2.19

150

250

0.6

1

5

7

0.8

1.2

*1

Operatingtemperature
range, °C

from -60 to +90

Repetition rate: 0.5 kHz, pulse duration: 1 ms, duty cycle: 50%, current: 200 mA.
*2
Repetition rate: 0.5 kHz, pulse duration: 20 μs, duty cycle: 1%, current: 1 А.

*LED dies included in the array can be changed by the manufacturer

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LED

Microsensor NT

LED arrays and matrices

LIGHT EMITTING DIODES
LED array spectra

Lms13-14-16-17-19-21LED-6M

Lms13LED

1,2
Lms13LED
Lms14LED

Lms14LED

Lms16LED

0,8

Lms17LED
Lms19LED

0,6

Lms21LED

Lms16LED

0,4
0,2
0
1000

1200

1400

1600

1800

2000

2200

2400

2600

Wavelength, nm

Intesity, a.u.

Intensity, a.u.

1

Lms17LED

Lms19LED

Availability to drive LED dies independently allows
scanning the spectral range from 1.3 μm to 2.1 μm. Suchapproach is used in our new device - LED analyzer (LA1T) which contains 8-element multi-wavelength LED
array and a wide-band photodiode (more information
available on the page 47).

Lms21LEDτ 2τ 3τ 4τ 5τ 6τ 1000

Time, µs

1200

1400

1600

1800

2000

2200

2400

Wavelength, nm

6 element multi wavelength LED array is available in the following packages:• TO-5 with a cap (with a glass window) - Lms13-14-16-17-19-21LED-6M;• TO-8 with a thermoelectric module with a cap (with a glass window) - Lms13-14-16-17-19-21LED-6M-TEM;
These standard matrix types are the basic versions that were designed mainly to give an idea about the possible arrayarrangement and evaluate its performance. We are always open to consider a special solution for the exact customers’ needs.

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LED

Microsensor NT

LIGHT EMITTING DIODES

LED arrays and matrices

For the custom arrays and matrices the number of elements included depends on the application and the chosen package
type. Standard TO-type packages offered by RMT Ltd. can be used. Packages with built-in thermoelectric modules (Peltier elements)
provide temperature stabilisation of LED chip parameters. Using these packages allows creation of different variations of LED
arrays, some of them are presented below.
Package type

LED matrix type

TO-18

TO-5

TO-5 TEM

TO-8 TEM

One-wavelength LED matrices
LmsXXLED-2М

ü

LmsXXLED-2М-TEM

LmsXXLED-3М



LmsXXLED-3М-TEM

LmsXXLED-4М



LmsXXLED-4М-TEM

LmsXXLED-6М



LmsXXLED-6М-TEM

LmsXXLED-9М



LmsXXLED-9М-TEM

LmsXXLED-12M



LmsXXLED-12M-TEM

LmsXXLED-16M



LmsXXLED-16M-TEM

Multi-wavelength LED matrices

Lms X1-X2 LED-2M (2 peak wl)

Lms X1-X2 LED-2M-TEM (2 peak wl)



Lms X1-X2-X3 LED-3M (3 peak wl)



Lms X1-X2-X3 LED-3M-TEM (3 peak wl)
Lms X1-X2 LED-4M (2 peak wl)









Lms X1÷X4 LED-4M-TEM (4 peak wl)
Lms X1÷X6 LED-6M (up to 6 peak wl)

Lms X1-X2 LED-4M-TEM (2 peak wl)
Lms X1÷X4 LED-4M (4 peak wl)

Lms X1÷X6 LED-6M-TEM (up to 6 peak wl)



Lms X1÷X9 LED-9M-TEM (up to 9 peak wl)



25
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Packages

LIGHT EMITTING DIODES

Generally, LEDs are mounted in the package that provides two electrical leads, a transparent optical window for the emission
and heat-sinking. An LED chip is soldered/ glued to the package surface that is connected to the one of the lead wires. Top contactof the chip is connected to the other lead with a bonding wire.
We offer a range of standard packages for LEDs and LED-matrices as follows:
TO-18 package with glass coverÇ4,25±0,1Glass cover45Å
LED chip

0,3

0,5

0,9

2,6±0,21
1

13,5±0,51

Ç2,5±0,12

Ç5,6±0,22 pins Ç0,4

TO-18 with a cap with/without a glass window
Ç4,8±0,2
Ç3,5±0,2

Ç4,8±0,2
Ç3,5±0,2

LED chip
LED chip0,32,6±0,2

1

13,5±0,52

2 pins Ç0,41
1

1

Ç5,6±0,2

Radiant characteristics for LED models in TO-18 package:
package with a cavity
20°

30°

40°

Intensity, a.u.

50°
60°
70°
80°
1.0

0.8 0.6 0.4

Ç2,5±0,1

2

2 pins Ç0,4

10°

2

0,2

4,1±0,20,24,1±0,20,3

LED chip

2,6±0,2
13,5±0,5

1

2

0,2

1

90°
0

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LIGHT EMITTING DIODES

Packages

TO-18-R and TO-18-RW with a parabolic reflector with/without a glass window

0,2
1

LED chip

10,3
13,5±0,50,2
22 pins Ç0,445Å

2,6±0,25,0±0,20,32,6±0,2
13,5±0,51

Ç9,0±0,2
Ç8,4±0,1

LED chip

5,0±0,2

Ç9,0±0,2
Ç8,4±0,1

LED chip

1

2

1

2

Ç2,5±0,1
Ç5,6±0,22 pins Ç0,4

Radiant characteristics for LED models in TO-18 package with a parabolic reflector:
package with a cavity

10°

20°

30°

40°

Intensity, a.u.

50°
60°
70°
80°
1.0

0.8 0.6 0.4

90°0

TO-18 package:• very miniature packages with limited area for mounting;• material – kovar, finish – gold/plating;• the number of lead pins is 2 or 3;• equipped with a cap (with/without a glass window) or a parabolic reflector (with/without a glass window).
LED models with glass cover are provided without cap/reflector.

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HEAD OFFICE LED Microsensor NT, LLC and R&D CENTRE Microsensor Technology, LLC
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Packages

LIGHT EMITTING DIODES
Ç9,2±0,1
Ç8,3±0,1
Ç5±0,1

TO-5-TEM with a cap (with a glass window)

LED chipon Si substrateLED
cathodeLED
anode

6,6±0,20,41,6±0,1

thermistor

1,2

TEC -

TEC +

0,98

13,5

0,8
30Å

6 pins Ç0,45

LED chipon Si substrate

0,4

1,6±0,1

Ç15±0,27,2±0,2TO-5-TEM-R with a parabolic reflector (with a glass window)

LED-FC
cathodeLED-FCanode

thermistor

1,2

Ç5±0,1
13,5

TEC -

TEC +

6 pins Ç0,45

TO-5-TEM package:
•
•
•
•
•

small packages with 3.2 x 3.2 mm2 thermocooler surface open for mounting ;header material – kovar, finish – gold/plating; thermocooler ceramics – Al2O3;
the number of lead pins is 6 or 8;
built-in thermoelectric module (TEM) – thermocooler and thermoresistor – provides LED chip temperature adjustment
and stabilization in the range +5 to +55 °C;
equipped with a cap (with a glass window) or a parabolic reflector (with a glass window).

7,20,1

1,50,1•

LED cathodeLED cathodeTECÇ15,2±0.1

•
•
•
•

1,91

Thermoresistor

Ç13,90,1
Ç9,50,1

1,6±0.05

TO-8-TEM with a cap (with a glass window)

4-40 UNC

LEDs anode

TEC

5,72
7,4

LEDs anodecompact packages with 7.4 x 7.4 mm2 thermocooler surface open for mounting;header material – kovar, finish – gold/plating, thermocooler ceramics – Al2O3;
the number of lead pins is 12 or 16;
built-in thermoelectric module (TEM) – thermocooler and thermoresistor – provides LED chip temperature adjustment
and stabilization in the range +5 to +55°C;
equipped with a cap with a glass window that protects LED device from damage.

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HEAD OFFICE LED Microsensor NT, LLC and R&D CENTRE Microsensor Technology, LLC
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LIGHT EMITTING DIODES

Packages

SMD CS3020 3 × 2 mm*
1,8
2,0
1
3,0

2,8

2

1
2
0,65
1,0

SMD CS35 3.5 × 3.5 mm*

3,50
2,64

Ç2,10
Ç2,00
0,10

0.35X45Å
(INDEX MARK)

0,80

0,37

R0.20

0,25

5

3

4

2,60,1

Ç4,30,1

6

1

5

2

4

3

2,00,12,00,15,00,10,100,50,1

1,50,1

1,30,12

1,20,1

6

1,40,1

1

1,60

1,580,10

SMD CS5-3M 5 × 5 mm*

1

2

3,30

2

1,580,101

1,70

INDEX MARK

1,00,2*All SMD packages can be substituted by other ones.
••

tiny packages for surface mounting;anode and cathode are led to the metalized areas on the back side of the ceramic surface;

In addition to our standard packages, we are ready to offer specifically designed solutions according to our customers’
needs.

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HEAD OFFICE LED Microsensor NT, LLC and R&D CENTRE Microsensor Technology, LLC
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Main parameters

PHOTODIODES

Photodiodes with cut-off wavelengths about 2.4 μm, 3.6 μm, 4.1 μm and 4.3 μm:

Specific Detectivity, cm*Hz1/2/W

Specific Detectivity D* for the different photodiode models
1E+11

1E+10
Lms24PD series
Lms36PD series
Lms41PD series

1E+09

Lms43PD series

1E+08
1000

1250

1500

1750

2000

2250

2500

2750

3000

3250

3500

3750

4000

4250

4500

4750

5000

Wavelength, nmStandard photodiode models – Lms MIR PD

Model

Sensitive
area, mmMax.
sensitivity
range, µm

Lms24PD-03

0.3

1.85-2.30

Lms24PD-05

0.5

Lms24PD-10

1.0

Lms36PD-03

0.3

NEW

Lms36PD-05

0.5

NEW

Lms41PD-03

0.3

Lms41PD-05

0.3

Lms43PD-03

0.3

Lms43PD-05

0.5

Lms36PD-03-CG

0.3

Lms36PD-05-CG

0.5

Lms43PD-03-CG

0.3

Lms43PD-05-CG

0.5

Cut-offwave
length,µm

Dark
current, µA

Resistance,
kOhm(10 mV)

Capacitance, pF

Photosensitivity,
A/W

10-60
5-20
50-2000.7-1.0(-1V)
10-1001.1-2.3
2.40-2.46
4-18
200-600
0.9-1.1(-1V)
150-700
1.8-2.3
2.38-2.41
0.6-2.0
1600-1800
1.0-1.2(-1V)
50-6002.45-3.10
3.7-3.8
0.2-0.6
200-300
0.7-0.8(-0.1V)
50-1000
2.2-3.4
3.6-3.7
0.2-0.8600-1400
1.0-1.5(-0.1V)
3.5-4.0
4.25-4.3 1500-5500(13-30)*10-3
0.9-1.1(-0.1V)
5500-10000 (5-8)*10-3
3.6-4.0
4.4
1.2-1.5(-0.1V)
2500-5500 (15-25)*10-3
3.8-4.2
4.6-4.7
1.8-2.2(-0.1V)
3.5-4.2
4.5-4.8 8000-25000(4-6)*10-3
1.0-1.6(-0.1V)
Standard photodiode models with a glass cover – Lms MIR PD-CG
50-6002.4-3.1
3.7-3.8
0.2-0.6
200-300
N/A(-0.1V)
50-1000
2.2-3.4
3.6-3.7
0.2-0.8600-1400
N/A(-0.1V)
2500-5500 (15-25)*10-3
3.8-4.2
4.6-4.7
1300-2600
N/A(-0.1V)
N/A
3.5-4.2
4.5-4.8 8000-25000(4-6)*10-3(-0.1V)
2.42-2.43

Noiseequivalent
power,
W/Hz1/2

Specific
Detectivity,
cm*Hz1/2/W(0.9-2.5)*10-12 (1.0-3.5)*1010(0.9-2.0)*10-12(2-5)*1010(2.4-5.2)*10-12 (1.7-3.7)*1010(6-13)*10-12(2-4)*109(3-9)*10-12(4.5-14)*109(2.1-4.0)*10-11 (0.8-1.4)*109(3.0-4.4)*10-11 (1.0-1.4)*109(1.2-1.8)*10-11 (1.7-2.6)*109(3-6)*10-11(0.6-1.0)*109

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

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HEAD OFFICE LED Microsensor NT, LLC and R&D CENTRE Microsensor Technology, LLC
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PHOTODIODES

Main parameters
Temperature shift of spectral response
Lms43PD-03

1,4

7°C
1,2

50°C

1
0,8
0,6
0,4

7°C

1,4

25°C

25°C

1,2

Sensitivity, a.u.

Sensitivity, a.u.

Lms36PD-05

1,6

0,2

50°C

1
0,8
0,6
0,4
0,2

0
2800

3300

3800

4300

0
2000

4800

2500

3000

3500

4000

Wavelength, nm

Wavelength, nm

Capacitance vs. reverse voltage
Lms43PD-03

2500
2000
1500
1000

50 °C
4000

Capacitance, pF

3000

40 °C

5000

25 °C

3500

26 °C

6000

5 °C

4000

12 °C

Capacitance, pF

Lms36PD-05

4500

1.8 °C

3000
2000
1000

500

0

0
-250

-200

-150

-100

-50

-200

0

-150

-100

-50

0

50

Voltage, mV

Voltage, mV

Capacitance vs. temperature (measured at reverse bias 10 mV)
Lms43PD-03

4000
3500

6000
5000

Capacitance, pF

Capacitance, pF

3000
2500
2000
1500
1000

4000
3000
2000

Udc = -10mV

500
-10

Udc = -10mV

1000
0

0
-20

Lms36PD-05

7000

0

10

20

Temperature, °C

30

40

-40

-20

0

20

40

60

80

Temperature, °C

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Main parameters

PHOTODIODES
Dark current vs. temperature (measured at reverse bias 10 mV)
Lms43PD-03

140
120

2000

100

Dark current, mA

Dark current, mA

Lms36PD-05

2500

80
60
40
Ur = 10 mV

20

1500

1000

500
Ur = 10 mV
0

0
0

50

100

-40

150

-20

0

20

40

60

80

100

Temperature, °C

Temperature, °C

Shunt resistance vs. temperature (measured at reverse bias 100 mV)
Lms43PD-03

45
40

2,5

35
30

2

Resistance, Ohm

Resistance, Ohm

Lms36PD-05

3

25
20
15
10

1,5
1
0,5

Ur = 100 mV

5

Ur = 100 mV

0

0
0

50

100

-40

150

-20

0

20

40

60

80

100

Temperature, °C

Temperature, °C

Lms43PD-03 dependences of dark current and shunt resistance vs. reverse voltage at different
temperatures
Lms43PD-03
-250

-200

-150

-100

Lms43PD-03
-50

700

0

1.8 °C

0

26 °C

-1500
1.8 °C

-2000

12 °C
26 °C
40 °C

Voltage, mVResistance, Ohm

Dark current, μA

-500
-1000

600

12 °C

500

40 °C

400
300
200
100

-2500
0
-3000

-250

-200

-150

-100

-50

Voltage, mV

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HEAD OFFICE LED Microsensor NT, LLC and R&D CENTRE Microsensor Technology, LLC
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0

LED

Microsensor NT

PHOTODIODES

Models with preamplifier

All the above mentioned PD models are available coupled with a preamplifier - PAb type (for more information about PAb
please refer to the page 42):-

Models with a built-in
thermoelectric module witha cap with a glass window
are available under request
Lms24PD-03-TEM-PA

Models with a built-in
thermoelectric module with areflector with a glass window
are available under request
Lms24PD-03-TEM-R-PA

Lms24PD-05-RW-PA
Lms24PD-10-RW-PA
Lms36PD-03-RW-PA

Lms36PD-03-CG-R-PA

Lms24PD-05-TEM-PA
Lms24PD-10-TEM-PA
Lms36PD-03-TEM-PA

Lms24PD-05-TEM-R-PA
Lms24PD-10-TEM-R-PA
Lms36PD-03-TEM-R-PA

Lms36PD-05-R-PA

Lms36PD-05-RW-PA

Lms36PD-05-CG-R-PA

Lms36PD-05-TEM-PA

Lms36PD-05-TEM-R-PA

Lms43PD-03-R-PA

Lms43PD-03-RW-PA

Lms43PD-03-CG-R-PA

Lms43PD-03-TEM-PA

Lms43PD-03-TEM-R-PA

Lms43PD-05-R-PA

Lms43PD-05-RW-PA

Lms43PD-05-CG-R-PA

Lms43PD-05-TEM-PA

Lms43PD-05-TEM-R-PA

Model without a glass
windowModel with a glass
windowModel with a glass
cover

Lms24PD-03-R-PA

Lms24PD-03-RW-PA

Lms24PD-05-R-PA
Lms24PD-10-R-PA
Lms36PD-03-R-PA

Photodiode models with preamplifier work in photovoltaic mode (with zero bias). Current
generated by photodiode is amplified and converted by preamplifier into a pulse voltage signal. Thereis straight correspondence between PD current and resulting output voltage. The signal converted bypreamplifier will have the same form, frequency and pulse duration as the photocurrent signal fromphotodiode.
Photodiode models with preamplifier are equipped with a parabolic reflector without/witha glass window and packaged in an aluminium tube for protection and screening. Parabolic reflector
protects PD device from damage and directs incident radiation on the sensitive area of the photodiode.
For the further signal conversion and synchronous detection of the signals from photodiodes with preamplifiers, we propose
SDM synchronous detector. SDM synchronous detector is tuned for optimal operation with LmsXXPD-XX-R-PA/LmsXXPD-XX-RWPA, LmsXXPD-XX-CG-R-PA and LmsXXPD-XX-TEM-PA/LmsXXPD-XX-TEM-R-PA models and simplifies signal measurement. For more
information regarding SDM synchronous detector please refer to the Electronics section, p. 43.

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Photodiode chip design

PHOTODIODESMid Infrared 0.3 mm photodiode chip
sensitive
area

ring contact –200/230 µm

200…250 µm

350…400 µm
contact

This shape of PD chip is typical for LmsXXPD-03 series photodiodes.
Main features are:• small size of the PD chip;• cost effective (due to small size).

Mid Infrared 0.5 mm photodiode chip800…850 µm

sensitive
area

ring
contact

800…850 µm
contact

This shape of PD chip is typical for LmsXXPD-05 series photodiodes.
Main features are:• larger size of the PD active area and, consequently, higher sensitivity;• mesa shaped structure.

Mid Infrared 1.0 mm photodiode chip
1450…1550 µm

sensitive
area

ring
contact

1450…1550 µm
contact

This shape of PD chip is typical for LmsXXPD-10 series photodiodes.
Main features are:• larger size of the PD active area and, consequently, higher sensitivity;• mesa shaped structure

34
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PHOTODIODES

Packages

We offer a range of standard packages for PDs as follows:
TO-18 with a glass cover
0,5

Ç4,25±0,1Glass cover45Å

2,6±0,2

1
3

1

1

0,2

13,5±0,5

1

3

3
2

PD chip
on Si substrate

2

2

1

Ç2,5±0,1
Ç5,6±0,2

3 pins Ç0,4

TO-18 with a cap with/without a glass cover45Å
14,1±0,2
2,6±0,2
1

3

3

1

2

3 pins Ç0,4

2

1

0,2

13,5±0,5

13,5±0,50,24,1±0,2
2,6±0,20,5

Ç4,8±0,2
Ç3,5±0,2

PD chip
on Si substrate

0,5Ç4,8±0,2
Ç3,5±0,2

PD chip
on Si substrate1

3

PD chip
on Si substrate2Ç2,5±0,1
Ç5,6±0,2

3 pins Ç0,4

TO-18-R and TO-18-RW with a parabolic reflector with/without glass coverÇ9,0±0,2
Ç8,4±0,1

PD chip
on Si substrate45Å

Ç9,0±0,2
Ç8,5±0,1

PD chip
on Si substrate

3

3 pins Ç0,4

5,0±0,2120,22,6±0,22

13,5±0,50,22,6±0,2
13,5±0,51

31

5,0±0,2

1

1

3

2

3 pins Ç0,4

Ç2,5±0,1
Ç5,6±0,2

TO-18 package:• very miniature packages with limited area for mounting;• material – kovar, finish – gold/plating;• the number of lead pins is 2 or 3;• equipped with a cap (with/without a glass window) or a parabolic reflector (with/without a glass window).
Photodiodes with a glass cover are provided without a cap/reflector.

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HEAD OFFICE LED Microsensor NT, LLC and R&D CENTRE Microsensor Technology, LLC
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Packages

PHOTODIODES

TO-5-TEM with a cap with a glass window

Ç9,2±0,1
Ç8,3±0,1
Ç5±0,1

LED chipon Si substrateLED
cathodeLED
anode

6,6±0,20,41,6±0,1

thermistor

1,2

TEC -

TEC +

0,98

13,5

0,8
30Å

6 pins Ç0,45

0,4

1,6±0,1

Ç15±0,2

LED chipon Si substrate

LED-FC
cathodeLED-FCanode

thermistor

7,2±0,2TO-5-TEM-R with a parabolic reflector with a glass cover1,2

Ç5±0,1
13,5

TEC -

TEC +

6 pins Ç0,45

TO-5 package:
•
•
•
•
•

small packages with 3.2 x 3.2 mm2 thermocooler surface open for mounting;header material – kovar, finish – gold/plating; thermocooler ceramics – Al2O3;
the number of lead pins is 6 or 8;
built-in thermoelectric module (TEM) – thermocooler and thermoresistor – provides LED chip temperature adjustment
and stabilisation in the range +5 to +55°C;
equipped with a cap (with a glass window) or a parabolic reflector (with a glass window).

Photodiodes with a built-in preamplifier without a glass window LmsXXPD-XX-R-PA
and with a glass window LmsXXPD-XX-RW-PA
40,0

photodiode chip

2,6

⌀8,4

⌀12,0

⌀8,4

⌀12,0

40,0

photodiode chippreamplifier board

2,5

2,6
preamplifier board

Photodiode models with preamplifier are equipped with a parabolic reflector without/with a glass window and packaged in
an aluminium tube for protection and screening. Parabolic reflector protects PD device from damage and directs incident radiationon the sensitive area of the photodiode.

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PHOTODIODES

Overview

In response to customers’ requests we have developed different models of electronic units oriented for optimal operation
with mid-Infrared LEDs and Photodiodes. Drivers and amplifiers allow the arrangement of a very flexible and easy to use set-up to
carry out initial experiments concerning optical absorption measurements of gases, liquids and solid materials in the mid-infrared
spectral range. The available operational regimes can be selected to attain the maximum benefits of using the new narrow-bandgap mid-IR LEDs and PDs.
For LED power supply we produce and offer the following driver series:
LED driver D-41i – provides Pulse operation mode.
LED driver D-51i – provides Pulse operation mode; has an additional temperature control (monitoring) feature.
Minidriver mD-1c – provides qCW operation mode with fixed signal data parameters.
Minidriver mD-1p – provides Pulse operation mode with fixed signal data parameters.
For Photodiode signal processing we offer several solutions:
PAb preamplifier board – converts the output current of a photodiode into a pulse voltage signal with amplification. It is alsoavailable along with a photodiode in a single metal-tube packing: LmsXXPD-XX-R-PA/LmsXXPD-XX-RW-PA, LmsXXPD-XX-CG-R-PA
and LmsXXPD-XX-TEM-PA/LmsXXPD-XX-TEM-R-PA models.
SDM synchronous detector – measures voltage signal from the output of a photodiode preamplifier and converts it to the
DC voltage signal proportional to voltage amplitude from the input.
You can select the appropriate electronic device for your experiments using the following tables:

LED models compatibility with drivers
LED\electronic device

D-41i

D-51i

Minidriver
mD-1c

Minidriver
mD-1p

LmsXXLED (-R; -RW)

ü

ü

ü

ü

LmsXXLED-CG

ü

ü

ü

ü

LmsXXLED-TEM (-R)

ü

ü

ü

ü

PD models compatibility with preamplifier and synchronous detector (SDM)
PD\electronic device

PAb

SDM

LmsXXPD-XX (-R; -RW; -CG)

ü×

LmsXXPD-XX-TEM (-R)ü×

LmsXXPD-XX-R(-R; -RW; -CG-R)-PA×ü

LmsXXPD-XX-TEM(-R)-PA

×

ü

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Drivers for an LED and an LED array

ELECTRONICS

LED driver D-41i
Application
D-41i driver is designed for power supply of MID IR LED models.

Features•
D-41i driver provides pulse mode of operation (the mode of
maximum peak optical power of an LED).
•
Possibility to choose one of five current values (0.2, 0.6, 1.0, 1.5 and
1.9 A), one of four frequencies (0.5, 2, 8 and 16 kHz) and pulse duration
within four values (2, 5, 10 and 20 µs)* via driver’s jumpers.
• Synchronisation input terminal block allows:―― synchronising driver with an external device (synchronous detector etc.);―― synchronising two or more drivers simultaneously;―― setting custom frequency of the LED signal.
• Possibility of synchronization with an external device with the help of synchronisation output terminal block.
• Ease of use and durability.

Technical characteristics
Current waveform generated by the driver in pulse Parameters
mode
Input voltage

Drive current

2-20 μs

62 - 2000 μs
max. 2 A

Value
Stabilised +12 V

Voltage tolerance-5 to +5 %Power consumption< 4W

Board dimensions

80 × 70 × 15 mm

Synchronization output voltage

5V

Signal data

Pulse mode

Pulse duration*

2, 5, 10 and 20 µs

Repetition rate

0.5, 2, 8 and 16 kHz

Output current amplitude

0.2, 0.6, 1.0, 1.5 and 1.9 A

f = 0.5 - 16 kHz

Time*Different values of the pulse duration can be adjusted for the better performance of the LED (LED-PD optopair), follow thedata pointed in the specification provided with the ordered driver.

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ELECTRONICS

Drivers for an LED and an LED array

LED driver D-51i
Application
D-51i driver is designed for power supply and intrinsic temperaturemonitoring of MID IR LED models.

Features•
D-51i driver provides pulse mode of operation (mode of maximum
peak optical power of an LED).
•
Possibility to choose one of five current values (0.2, 0.6, 1.0, 1.5 and
1.9 A), one of four frequencies (0.5, 2, 8 and 16 kHz) and pulse duration
within four values (2, 5, 10 and 20 µs)* via driver’s jumpers.
• Synchronisation input terminal block allows:―― synchronising driver with an external device (synchronous detector etc.);―― synchronising two or more drivers simultaneously;―― setting custom frequency of the LED signal.
• Possibility of synchronization with an external device with the help of synchronisation output terminal block.
• Temperature control – possibility to judge about LED p-n junction temperature using current-voltage dependence.
Driver generates the low current signal for plugged LED, measures and outputs the voltage. Using the obtained voltage
value it is possible to calculate the intrinsic LED temperature.
• Ease of use and durability.

Technical characteristics
Current waveform generated by the driver in pulse Parameters
mode
Input voltage

Drive current

2-20 μs

62 - 2000 μs
max. 2 A

Value
Stabilised +12 V

Voltage tolerance-5 to +5 %Power consumption< 4W

Board dimensions

80 × 70 × 15 mm

Synchronization output voltage

5V

Signal data

Pulse mode

Pulse duration*

2, 5, 10 and 20 µs

Repetition rate

0.5, 2, 8 and 16 kHz

Output current amplitude

0.2, 0.6, 1.0, 1.5 and 1.9 A

f = 0.5 - 16 kHz

Time*Different values of the pulse duration can be adjusted for the better performance of the LED (LED-PD optopair), follow thedata pointed in the specification provided with the ordered driver.

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Drivers for an LED and an LED array

ELECTRONICS

Minidrivers mD-1c and mD-1p
Application
mD-1c and mD-1p minidrivers are designed for power supply of MID IR LED models.

Features••••

Minidriver mD-1c provides qCW mode of operation with fixed signal data parameters (amplitude, repetition rate andpulse duration).
Minidriver mD-1p provides pulse mode of operation with fixed signal data parameters (amplitude, repetition rate andpulse duration).
Possibility of synchronization with an external device (such as LMSNT SDM synchronous detector) with the help ofsynchronization output contacts.
Ease of use and durability.

Technical characteristics
Parameters

Value

Input voltage

Stabilised +12 V

Voltage tolerance-5 to +5 %Power consumption< 4W

Board dimensions

24 × 12 mm

Synchronization output voltage

5V

31-1000 μs 31-1000 μs

max. 0.25 A

f = 0.5 - 16 kHz

Drive current

Drive current

2-20 μs

62 - 2000 μs
max. 2 A
f = 0.5 - 16 kHz

Time

Time

mD-1c (qCW)

mD-1p (pulse)

Signal data

qCW

Signal data

Pulse mode

Pulse duration

500 µsPulse duration

5 µs

Repetition rate

1 kHz

Repetition rate

2 kHz

Output current amplitude

150 mA

Output current amplitude

2A

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ELECTRONICS

Drivers for an LED and an LED array

NEW Multichannel driver MCD
Application•••

MCD driver is a utility board that unites several functions:power supply of LED arrays comprising of Mid-IR LEDs, supporting up to 8 channels;
photodiode signal processing and amplification;synchronisation of LED and photodiode signals.

Features••••

Pulse mode operation (mode that provides maximum peak optical power).
LED current amplitude and pulse duration are preset by manufacture.
Built-in photodiode preamplifier for PD signal amplification and processing or ability to connect the external photodiodepreamplifier.
Built-in 8-channel synchronous detector, which provides synchronisation with a photodiode preamplifier and further
signal amplification.

Compatibility table
One-element LED models

Standard multielement LED models

LmsXXLEDü

LmsXXLED-4M

ü

LmsXXLED-R

ü

LmsXXLED-4M-R

ü

LmsXXLED-RWüLmsXXLED-4M-RW

üLmsXXLED-TEM

üLmsXXLED-4M-TEM

üLmsXXLED-TEM-R

ü

LmsXXLED-4M-TEM-R

ü

Lms13-..-21LED-6M

ü

Lms13-..-21LED-6M-TEM

üTechnical characteristics
Parameters

Value

Fixed parameters

Value

Input voltage

Stabilised +12 V

Pulse duration

20 µs*

Voltage tolerance-5 to +5 %Repetition rate (per channel) 0.5 kHz

Input current

max. 0.25 A

Repetition rate (8 channels)

4 kHz

Board dimensions

105 × 70 × 15 mm

Output current amplitude

0.4 A*

Signal output voltage
11 V (-4 V for inverted PD
Output signal gain
1x - 10x
amplitude
signal)(adjustable)*Pulse duration and current values in the table are default, but can be preadjusted by manufacturer according to acustomer’s request.

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PAb preamplifier

ELECTRONICS

Application
PAb preamplifier is oriented for amplification and conversion of the pulse current
signal generated by photodiodes (PDs). The resulted voltage signal has the same form as
the photocurrent, i.e. if the photocurrent from photodiode is a meander, the converted
signal will be a meander too with the same frequency and pulse duration. Current into
voltage conversion coefficient is constant and depends on given photodiode.

Features•••

Enables PD operation at photovoltaic mode (with no reverse bias).
Provides conversion of PD photocurrent to a voltage signal with amplification.
Adjustment for the exact photodiode type is required for the proper operation.

Compatibility table
Photodiode models
LmsXXPD-XX

üLmsXXPD-XX-R

ü

LmsXXPD-XX-RWüLmsXXPD-XX-CG

ü

LmsXXPD-XX-R-PA

×

LmsXXPD-XX-RW-PA

×

LmsXXPD-XX-CG-R-PA

×

LmsXXPD-XX-TEM

ü (under request)

LmsXXPD-XX-TEM-R

ü (under request)

LmsXXPD-XX-TEM-R-PA

×

LmsXXPD-XX-TEM-RW-PA

×

Technical characteristics
Parameters

Value

Input voltage

Stabilised +5 V

Voltage tolerance-5 to +5 %Board dimensions

10 × 26 mm

PAb preamplifier is also available along with a photodiode in a single metal-tube packing:
LmsXXPD-XX-R-PA/LmsXXPD-XX-RW-PA, LmsXXPD-XX-CG-R-PA and LmsXX-PD-XX-TEM-PA/LmsXXPD-XX-TEM-R-PA

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ELECTRONICSSDM synchronous detector

Application
SDM synchronous detector measures voltage signal from the output of aphotodiode preamplifier and converts it to the DC voltage signal proportional toamplitude of the voltage from input.

Features• Three independent channels for detection. One can connect three systems with drivers
and preamplifiers and run them through the synchronous detector simultaneously.
• Built-in power supply for preamplifiers.
• Possibility of input polarity inversion using the appropriate jumper. In case of wrong
polarity connection from photodiode preamplifier one can simply switch the input polarity inversion jumper.

Technical characteristics
Parameters

Value

Input voltage

Stabilised +12 V

Voltage tolerance-5 to +5 %Power supply current, max< 0.1 A

Board dimensions

70 × 70 × 19 mm

Synchronization output voltage

5V

Output constant voltage signal, max

10 V

Parameters

Value

Averaging time

100, 200 and 300 ms

Voltage tolerance

1x, 5x and 10x

Parameters

Value

Pulse duration

2 - 20 µs

Repetition rate

0.5 - 16 kHz

Input voltage signal from preamplifier, max

±3 V

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MDK/CDK and MDK-c/CDK-c

EVALUATION KITS AND SYSTEMS

Mid-infrared light-emitting diodes and photodiodes manufactured by LED Microsensor NT, LLC have already found theirusefulness in a vast area of applications. For the first-time users we announce sample systems and kits that enable fast preliminary
experiments with mid-infrared LED-PD optopairs for different detection purposes.

Evaluation kits for methane (MDK and MDK-c) and carbon dioxide (CDK and CDK-c)
detection
Evaluation kit for CH4 detection (MDK) includes:• Lms34LED-RW;• Lms36PD-05-RW-PA;• org glass optical chamber (optional, under request);• LED Driver (D-41i / D-51i / mD-1p);• synchronous detector SDM;
• AC/DC Adaptor, connection wires.

Evaluation kit for CO2 detection (CDK) includes:• Lms43LED-RW;• Lms43PD-03-RW-PA;• org glass optical chamber (optional, under request);• LED Driver (D-41i / D-51i / mD-1c);• synchronous detector SDM;
• AC/DC Adaptor, connection wires.

MDK-c and СDK-c are advanced evaluation kits for CH4 and CO2 detection with glass-covered LED and photodiode, which
includes all the needed components for quick and simple start.
Evaluation kit for CH4 detection (MDK-c) includes:• Lms34LED-CG-R;• Lms36PD-05-CG-R-PA;• LED Driver (D-41i / D-51i / mD-1p);• synchronous detector SDM;
• AC/DC Adaptor, connection wires.

Evaluation kit for CO2 detection (CDK-c) includes:• Lms43LED-CG-R;• Lms43PD-03-CG-R-PA;• LED Driver (D-41i / D-51i / mD-1c);• synchronous detector SDM;
• AC/DC Adaptor, connection wires.

Connection setup

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EVALUATION KITS AND SYSTEMS

MDS-5/CDS-5

Evaluation systems for methane (MDS-5) and carbon dioxide (CDS-5) detection
Evaluation system for CH4 detection (MDS-5) includes:• optical cell with:―― Lms34LED-CG;―― Lms36PD-05-CG;• PD preamplifier;• LED Driver (D-41i / D-51i/mD-1p);• synchronous detector SDM;
• AC/DC Adaptor, connection wires.

Evaluation system for CO2 detection (CDS-5) includes:• optical cell with:―― Lms43LED-CG;―― Lms43PD-03-CG;• PD preamplifier;• LED Driver (D-41i / D-51i/mD-1c);• synchronous detector SDM;
• AC/DC Adaptor, connection wires.

Connection setup

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MDS-4

EVALUATION KITS AND SYSTEMS

MDS-4 Methane sensor module
Application & Description
MDS-4 is a sensor module for CH4 detection. It includes a compact optical cell and electronics for LED power supply and PD
signal amplification all-in-one.

Features
•
•
•
•
•
•
•
•
•
•

Measurement in 0-5% (volume) concentration range.
Resolution down to 250 ppm in 0-5% (volume) concentration range.
Very low power consumption – 3.5 mW.
Quick response time – <2 s.
Operating temperature range – 0..+40°C.
Size: 55 x 26 x 14 mm (including optical cell and circuitry).
Gases: precalibrated for methane, but will respond to most hydrocarbons.
Possibility of integration with wireless data transfer protocols like Zigbee, WiFi, GPRS.
Possibility of power battery supply.
Analogue output signals.

Technical characteristics
Parameters

Value

Power supply voltage

Stabilised +3.3 V

Voltage tolerance-5 to +5 %Power consumption

3.5 mW

Board dimensions

55 × 26 × 14 mm

Measuring output voltage signal amplitude

3V

Temperature output voltage signal amplitude

3V

NEW MDS-4D sensor prototype with a built-in analogue-digital converter, autonomous power supply and ZigBee/Bluetooth
data transmission modules will be available for purchasing in 2016.**The design of the device may be changed

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EVALUATION KITS AND SYSTEMS

LED Analyser LA-1T

Application & Description
LED Analyser (LA-1T) is oriented for the initial experiments with different liquid (and other) substances, and enables defining
the absorption properties of the analysed sample in the spectral range 1.3 – 2.3 µm.

Design
The LA-1T is formed in a single body that includes optical and electronic modules. Opticalmodule utilizes a single pass transmittance scheme and includes:•
8-element LED array with peak emission wavelengths about 1.3, 1.4, 1.6, 1.7, 1.9, 2.1, 2.2 and2.3 µm;•wideband photodiode with a cut-off wavelength about 2.4 µm.
The distance between the LED array and the photodiode is fixed and is about 15 mm. Simple
preparation glasses can be used for liquid sample placing. LEDs light up sequentially, photodiodedetects the emission passing through the analyzed sample and the obtained signal values are displayedon the main diagram of the program included in the analyser set.

Electronic module enables:―― LED power supply (at a one fixed mode);―― amplification of the photodiode signal;―― synchronous operation of the LED array and the photodiode.
―― incorporate ZigBee/Bluetooth wireless data transmission module.

LA-1T optical module

LED analyser is intended to be used as an evaluation tool for the following applications:• paper moisture control;• plastic thickness detection;• water concentration measurement in cut-oil and oil products, with possibility to define ratio of light and heavyhydrocarbons;• analysis of biomaterials for medical purposes (concentration of sugar in blood, urine etc.);• express analysis of food – defining deviations from the normal parameters judged by the absorption properties.

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Contacts

LED Microsensor NT, LLC (head office)Microsensor Technology, LLC (spin-off R&D company)
Legal address:
10, A, Kurchatova str., 1N,
St-Petersburg, 194223, Russia
Post address:
P.O. Box #100,
194223, St. Petersburg, Russia
Telephone:+7 812 633 06 35
Fax: 		
+7 812 633 06 37
E-mail:		
info@lmsnt.com
Web:		
www.lmsnt.com

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HEAD OFFICE LED Microsensor NT, LLC and R&D CENTRE Microsensor Technology, LLC
10, A, Kurchatova str., 1N, St-Petersburg, 194223, Russia; info@lmsnt.com; www.lmsnt.com