SOLUTION SHEET

FiberFlow LDA systems

Fiber-based, highly flexible and top performing solution

FiberFlow LDA system

When flexibility, upgradeability and performance mattersin flow measurements
The Dantec Dynamics FiberFlow LDA system is a highly flexible solution for non-intrusive
measurements of velocity at a point in space as a function of time. This Laser Doppler
Anemometry (LDA) solution uses fiber optics to connect the laser and the transceiverprobe. Many applications benefit from or require a fiber optic connection for intrinsic
safety, submersion, or remote locations. We offer a variety of probe sizes, laser types, andconfigurations of transmitter and processor, which allow you ultimate flexibility to meetyour flow measurement needs.
The FiberFlow LDA can easily be upgraded and reconfigured to suit the requirements ofexisting and new applications. With a full range of options and accessories including ourfull featured software, our FiberFlow LDA solution is the best-in-class system.

Key benefits•Non-intrusive LDA technique makes measurements possible in flames and internal
flows with moving parts such as pumps, turbines, engines etc.

•Fiber optic connection between laser and probe without electronics meetsrequirements for C1D1 and other challenging environments•

1-, 2- and 3 velocity component configurations•

Compact all-in-one laser transmitter including power supply, controller andfrequency shift optics•

Laser power up to 1W for high performance even at long measurement distances•High transmission efficiency due to re-engineered optics with fewer components•

Four probe sizes with a range of front lenses to match flow rigs of any size•

Automatic laser safety shutters for user protection•Output polarization selectable for PDA applications

The FiberFlow LDA solution in brief
Laser Doppler Anemometry (LDA) is an optical technique ideal for nonintrusive 1D, 2D and 3D point measurement of velocity and turbulence inflows in a wide range of fluid mechanical applications. It is based on theDoppler effect of laser light scattered from seed particles that follow theflow. The main benefits of LDA over other methods is that the transfer
function is linear, small measurement volumes are possible, and theabsolute accuracy of the measurement results are unmatched due tocalibrated Doppler constant and signal processor performance.
The solution is based on four core components: Probe, transmitter/laser,signal processor, and software.
The modular design allows you to choose between two performance levelsof the signal processor, three laser power levels, and optics for one, two, orthree velocity components. Four sizes of probes allow measurements fromdistances of a few cm up to several meters.

Frte
fl

Standard 1D, 2D and 3D LDA FiberFlow solutions

Transmitting optics
Compact all-in-one optics
The LDA FiberFlow solution uses optical fibers to connect the lasers, probe,and detectors making the transceiver probes compact and easy to mounton a traverse. The fiber cable to the probe can be up to 20 m long. This
makes it the ideal LDA solution for large facilities or where limited access tothe test area is required.

Processor
Fast & powerful all-in-one processor
The BSA F600 processor is a fast and powerful all-in-one processor. With
Ethernet, wifi and USB interfaces included, the processor can be connected
to a PC via a local area network, wireless or cabled. In large facilities orwhere remote access is required, these features make it easy to have theprocessor near the experiment and separate the PC at a long distance away
for safety and/or convenience.
Page 2The FiberFlow laser transmitter and a 60mm probe.

The processor’s 120 MHz bandwidth covers a wide velocity range, up to several
hundred m/s depending on the optical configuration. System setup is very easy
and user friendly: the setup is done directly in velocity units, based on a center
velocity and a velocity span value. The processor’s on-line signal monitor
provides immediate feedback about signal quality, data rate and validation, thecoincidence between channels, PM anode current and high voltage. This is a
powerful tool for optimizing set-up and monitoring of experiments.
For further details on the processing performance, please consult separate
data sheet on “Burst Spectrum Analyzer (BSA)” on our website.

Data Analysis
The most flexible and comprehensive software for LDA measurements
The BSA Flow software is comprehensive, easy to use, and includes extensive graphics and data exchange features. The system setup including theoptical configuration as well as processor settings is controlled via thesoftware. Tools are provided which enables user-defined data analysis anddisplay, which is dynamically updated during measurements.
Data analysis can be customized with a built-in Calculation module as well as
a MatLab link for ultimate flexibility. Graphical output includes vector plots,
2D line and scatter plots, and 3D plots. Graphic results can be transferred
to a measurement report in pdf or HTML format. Numerical output includes
binary, ASCII, MS Excel, and TecPlot formats.
For further details on the software performance, please consult separate
data sheet on “BSA Flow Software” on our website.

BSA Flow with Advanced Graphics add-on

FiberFlow LDA configurations
The FiberFlow LDA solution is offered in the following 1D, 2D and 3D
configurations.

Standard

Probe diameterTransmitter & laser

1D60 mm

532 nm 100 mW

1D60 mm

532 nm 300 mW

1D60 mm

532 nm 1W

2D

60 mm

532/561 nm 100/100 mW

2D

60 mm

532/561 nm 300/300 mW

2D

60 mm

532/546 nm 1/1W

3D60 mm532/561/553 nm 100/100/100 mW

3D

60 mm

532/561/553 nm 300/300 /200 mW3D

60 mm

532/546/520 nm 1/1/1W

Processor

Software

BSA F600(120 MHz max.
frequency)

BSA Flow Software
Advanced Graphics add-onOptions
The modular design of the FiberFlow system provide for several configurations to meet the needs of the measurement application. The options
include:Probes: 14 mm and 27 mm probes are suitable for confined spaces and/orsmall flow rigs. 112 mm diameter probes are well suited for larger facilities
with up to >1m measurement distance.
Beam Expanders: Improves the signal quality (SNR) and reduce themeasurement volume size especially at longer measurement distances.
Available for 60 mm and 112 mm probes.
Processors: A wider velocity range can be covered using the BSA F800
upgrade which offers 200 MHz max. frequency. Supersonic and Hypersonicspeeds can be measured depending on the optical configuration.
Page 3

Software: Spectrum/Correlation Add-on, Cyclic Phenomena Add-on,
Scripting and MATLAB link Add-on, LIF and Parametric Analysis Add-on.
Traverse: Traversing mechanism can be added to the system, to becontrolled from the software so that fully automated experiments arepossible. Several standard traverse controllers are supported in thesoftware. For further details on the software performance, please consult
separate data sheet on our website.
Seeding: For air flows a range of liquid droplet and solid particle seeders
are available. For liquid flows, we offer a variety of seeding particles. Pleasesee separate data sheets on our website.
Calibration: Traceable calibration is available for systems with 60 mm
probes. The calibration data is read directly into the Software from a CD
provided with each lens. Please see separate data sheet on our website.

Technical specifications
Probes14 mm

Fiber cable length

27 mm

60 mm

112 mm

5 m, 10 m or 20 m (other length on request)

Probe dimensions(incl. front lens, excl. cables)Ø14 x 116mm

Ø27 x 205mm

Ø60 x 275mm

Ø112 x 494
mm

Probe material

Stainlesssteel

Stainlesssteel

Anodized
Aluminum

Anodized
Aluminum

Probe weight (excl. front lens,incl. cables)

0.1 kg

0.4 kg

2.0 kg

4.5 kgProcessor

BSA F600

BSA F800

Max. input frequency

120 MHz

200 MHz

Velocity range*)

560 m/s

1,120 m/s

Data rate>100,000 bursts/sec

Resolution>16 bits*) depends on the optics, example for 60 mm probe with 500 mm focal length, 532 nm wavelength
Software
BSA FlowFeatures
Online oscilloscope display of signals
Online display of data validation, data rate, coincidence rate,
photomultiplier anode current
Set up of BSA processor
Acquisition of data from BSA,
Control of traversing system
Statistics of results (mean, RMS, Skewness and Flatness
Listing of results
Set up of analysis sequences
Export of data

Advanced Graphics
Add-onX-Y plots, vector plots, 3D plots, velocity profile plots

Solution Sheet SS_0491_v3 . Subject to change without notice. Copyright © 2020.
Dantec Dynamics. All Rights Reserved. www.dantecdynamics.com