Monochromatic flow profile sensor with time division multiplexing and calibration models for fluids
The aim of highly spatially resolved flow profile measurements even at large
working distances can be achieved by means of the laser Doppler velocity (LDV)
profile sensor, whose properties have been investigated within a research project
funded by German Research Foundation. The sensor is based on the utilization
of two superposed interference fringe systems distorted by defined wavefront
curvature. Using a two-channel measurement, which so far has been generated
by means of two laser wavelengths, the position of particles carried with the flow
can be determined with micrometer spatial resolution. Measurements in the
proximity of walls can be performed using fluorescent scattering particles, however,
a sensor employing only one laser wavelength is necessary to this end.
Hence, a monochromatic profile sensor based on time division multiplexing is to
be investigated and realized until a demonstrator within this transfer project.
Beside measurements in wall proximity, one key aspect of this project will be the
development of a model for sensor calibration. Since the geometries of the interfe-
rence fringe systems depends on the refractive index of the surrounding
medium, any change of the working fluid would demand a new calibration. Especially
in liquids, a calibration based on rotating velocity references is impractical,
so that a deep penetration of the market cannot be expected. This problem will
be solved by developing a calibration model.
Staff: F. Bürkle, C. Schober, F. Schmieder
Period: 01/17 - 12/19
LDV with Nd:YAG-Laser of the ILA R&D GmbH
K. Shirai, L. Büttner, J. Czarske, „Development of a New Calibration Method for Laser Velocimetry toward
Establishing Traceability in Flow Measurements”, The Review of Laser Engineering 42(5):404-411, 2014
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M. Bermuske, L. Büttner, J. Czarske, S. Heitkam “Phasenaufgelöste Strömungsgeschwindigkeitsprofilmessungen in Grenzschichten an ansteigenden Luftblasen”, GALA Fachtagung “Experimentelle Strömungsmechanik”, Karlsruhe, Germany, 05.09 – 07.09.2017
A. E. Ramos Ruiz, C. Schober, F. Schmieder, F. Moyon, L. Feierabend, M. Dues, J. W. Czarske, L. Büttner „Hochaufgelöste Strömungsmessungen in den Mikrokanälen einer Brennstoffzelle mittels Zeitmultiplex- Laser-Doppler-Geschwindigkeitsprofilsensor“, 26. GALA-Fachtagung “Experimentelle Strömungsmechanik”, S. 17.1–17.8, 4. – 6.09.2018, Rostock