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A back scattering laser Doppler velocimeter is described which comprises only a single unit, the same lens being used to transmit and collect the light.This overcomes alignment difficulties, and is seen to give a good signal-tonoise ratio when used for measuring water flow and a moving opaque object with a lower power laser and photodiode as detector.A theoretical expression is developed for the change in velocity resolution as the fringes are rotated relative to the direction of motion and good agreement with experimental results is obtained.
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Clive Greated (1971) studied this question.
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