Yu.N. Dubnishchev, J. Kompenhans
Institute of Thermophysics Siberian Branch of the Russian Academy of Sciences (SB RAS),
German Aerospace Center (DLR), Institute of Aerodynamics and Flow Technology

The multi–particle scattering problem in Doppler global velocimetry

The method of laser Doppler visualization and measurement of a velocity field in flows with suppression of influence of a multi-particle scattering is discussed. The investigated section in the flow is illuminated with a laser sheet. The new concept is based on reception of the paired differences of frequency–demodulated normalized images of the laser sheet in light beams scattered in various directions.
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