Measurement of Fluid Velocity Gradients Using Laser-Doppler Techniques
- 1 September 1971
- journal article
- research article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 42 (9) , 1317-1320
- https://doi.org/10.1063/1.1685375
Abstract
Two methods are developed for the measurement of fluid velocity gradients using a laser‐Doppler anemometer. In the first method the velocity gradient is found by a single measurement of the bandwidth of the laser‐Doppler signal spectrum. In the second, velocity gradients very close to a wall are calculated from the amount the signal spectrum shifts in frequency for a small change in the position at which the spectrum is measured. Both methods are examined theoretically and experimentally.Keywords
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