From Deep UV to Mid-IR

An ITW CompanyInfrared Emitters – SHA Series
KEY FEATURES• High Power Steady State (DC) Emitters••••Emulates a Black-body in Spectral Distribution
Coiled Filament with Specialized CoatingReflector Provides Collimated and Uniform Radiation
Typical Emissivity 0.70

High Power Steady-State Emitters - SHA Series
Opto Diode High Power SHA Series infrared (IR) emitters are designed to be used as steady state (DC) emittersof black-body radiation. The radiating element in the steady-state emitters is a coiled filament of specific materialwith a specialized coating with typical emissivity of 0.70. Radiated output closely emulates a black-body inspectral distribution. SHA Series emitters are designed to operate at a rated filament temperature of 1170 K.
SHA Series emitters are offered in TO-5 packages with specific filament diameters and number of coils to provide
the desired input/output power at a filament temperature of 1170 K. The emitters include a parabolic reflector toprovide near collimated and uniform radiation output. These packages come with or without windowing options.
Drive Circuit
Any constant voltage or constant current DC power supply with appropriate rating.
Filament Temperature vs. Input Power
Steady State emitters are designed to operate with a filament temperature of approximately 1170 K (900°C) at therated input power. Exceeding this value will raise the element temperature and decrease emitter lifetime. Since
the radiated energy is proportional to the fourth power of the absolute temperature (T4), accurate control of theinput power and proper heat sinking of the package are essential to maintain constant element temperature andoutput. The heat sink must limit the package temperature to not more than 100°C. The relationship between peakwavelength (λpk in microns) and temperature (T in Kelvin) for the black-body spectrum is expressed by Wien’s lawas:λpk (microns) x T ( K) = 2898
Thus, the wavelength for maximum output varies inversely with the absolute temperature. At a temperature of1170 K, this maximum is at 2.5 microns. SHA Series steady state emitters are quasi-black-body with an emissivityof 0.70. The emissivity is the ratio of the energy radiated by the source to that which would be radiated by a true
black-body at the same temperature.

Revision May 22, 2019

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From Deep UV to Mid-IR

Infrared Emitters – SHA Series

An ITW Company

Black-body Radiant Emittance
SHA Series emitters approximate black-body sources at their particular operating temperature. Below is areference graph showing ideal black-body curves at various temperatures, in K.
3.0(W cm-2 micron-1)

2.5
2.0
W500 (λ)
W750 (λ)
W1000 (λ)
W1170 (λ)

1.5
1.0
0.5
0.0

12345678910111213141516171819 20

λ (microns)

Revision May 22, 2019

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From Deep UV to Mid-IR

Infrared Emitters – SHA Series

An ITW Company

DC Power Curves (I vs. V)12.5CurveSource
Pk DC PowerNo.
Model(watts)
1SHA727-5M( )1.15
2 SHA1037-5M( )
2.10

AMPS

2.0
1.5

3 watts

1.0

2 watts

20.5

10.0
0.0

1 watts

0.5

1.0

1.5

2.0

2.5

VOLTS
11170 K at power indicated (•). Exceeding this value will raise element temperature and decrease source lifetime.

Average DC Intensity (@ 1170 K) vs. Angle (@ 3 inches)21E-2WATTS PER CM2

SHA727-5M (@ 1.15 watts)
SHA1037-5M (@ 2.10 watts)

1E-3-25-20-15-10-50510152025

POLAR ANGLE (degrees)
2Average of values parallel and perpendicular to axis of element.

DC Intensity (@ 1170 K) vs. Distance

WATTS PER CM2

1E-1
SHA727-5M (@ 1.15 watts)
SHA1037-5M (@ 2.10 watts)
1E-2

1E-3

1E-4

110
AXIAL DISTANCE (inches)

Revision May 22, 2019

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From Deep UV to Mid-IR

Infrared Emitters – SHA Series

An ITW Company

Window Spectral Transmission OptionsTRANSMISSION (%)

100

Sapphire(0.5 mm thick)Calcium Fluoride(1.0 mm thick)8060402000.1

110100WAVELENGTH (µm)

TO-5 Package
0.260
45.0°

0.50 MIN
0.040 MAX

0.040

0.031

2X Ø0.018 ±0.002
0.250
0.325 APERTURE
AØ0.200MOUNTING SURFACE

Ø0.360Ordering Information
SHA-XXXXX-YYY
SHA – S Source, H High Power, A Steady StateXXXXX – Filament and Foil Dimensions
YYY – Packaging Options and Window Options
SHA727-5M0 (40100) High Power Steady State Emitter 727 in TO5 Windowless Package
SHA1037-5M0 (40099) High Power Steady State Emitter 1037 in TO5 Windowless Package

Specifications are subject to change without prior notice.

1260 Calle Suerte, Camarillo, California 93012
Phone: +1 805.499.0335 | Fax: +1 805.499.8108 | sales@optodiode.com | www.optodiode.com
Revision May 22, 2019

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