Abstract:
An analysis is made of a laser Doppler anemometer in which the probe laser beams are oppositely directed. The coordinate dependence of the spatial frequency of the interference field shows that the relative deviation from its average value can be less than $10^{-5}$ in the investigated range. A description is given of a prototype anemometer for measuring the axial velocity of a stream. The use of an ultrasonic modulator makes it possible to determine the direction of the velocity vector. The results are reported of a determination of the velocity profile in three longitudinal sections through a channel.
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