TY - JOUR
T1 - Heterodyne laser-Doppler line-sensor for highly resolved velocity measurements of shear flows
AU - Shirai, K.
AU - Büttner, L.
AU - Czarske, J.
AU - Müller, H.
AU - Durst, F.
N1 - Funding Information:
The authors thank DFG (Cz55/9-2) for funding a part of the present work. Mr. E. Guillotel and Ms. C. Höltzel are acknowledged for their laboratory experimental works. Mr. C. Wallenhauer is appreciated for realizing the frequency controlling circuit. Messrs T. Razik, M. Steilmann, F. Runge and T. Pfister are acknowledged for their works on the signal processing.
PY - 2005/8
Y1 - 2005/8
N2 - We report on the application of a heterodyne laser-Doppler line-sensor for spatially highly resolved shear flow measurements. The line-sensor employs a wavelength-division-multiplexing (WDM) technique, which generates a measurement volume with convergent and divergent fringes for two laser wavelengths, respectively. The evaluation of the ratio of the resulting two Doppler frequencies yields the particle velocity and position inside the measurement volume with a resolution of a few micrometers. A line sensor with directional discrimination was realized by using a heterodyne technique. The measurement signal is generated in the intermediate frequency band, allowing the evaluation of small velocities with high accuracy. We report on the measurement of laminar boundary layers and for the determination of the wall shear stress. Good agreement was obtained between the measured velocity and the Blasius solution.
AB - We report on the application of a heterodyne laser-Doppler line-sensor for spatially highly resolved shear flow measurements. The line-sensor employs a wavelength-division-multiplexing (WDM) technique, which generates a measurement volume with convergent and divergent fringes for two laser wavelengths, respectively. The evaluation of the ratio of the resulting two Doppler frequencies yields the particle velocity and position inside the measurement volume with a resolution of a few micrometers. A line sensor with directional discrimination was realized by using a heterodyne technique. The measurement signal is generated in the intermediate frequency band, allowing the evaluation of small velocities with high accuracy. We report on the measurement of laminar boundary layers and for the determination of the wall shear stress. Good agreement was obtained between the measured velocity and the Blasius solution.
KW - Heterodyne technique
KW - Laser Doppler anemometer
KW - Velocity profile near the wall
KW - Wall shear stress
KW - Wavelength division multiplexing
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U2 - 10.1016/j.flowmeasinst.2005.04.003
DO - 10.1016/j.flowmeasinst.2005.04.003
M3 - Article
AN - SCOPUS:23144451223
SN - 0955-5986
VL - 16
SP - 221
EP - 228
JO - Flow Measurement and Instrumentation
JF - Flow Measurement and Instrumentation
IS - 4
ER -