A simple two-component laser Doppler anemometer using a rotating radial diffraction grating

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Abstract
A direction-sensitive two-component laser Doppler anemometer is described. The basic element in this system is a rotating radial diffraction grating functioning both as a beam splitter and as a frequency shifter. Two different arrangements are discussed. One arrangement gives two non-orthogonal velocity components from which the on-axis velocity component could be derived. The second arrangement directly gives two orthogonal velocity components perpendicular to the optical axis. Experimental results are reported from measurements of the orbital velocities below artificially generated surface waves in a water flume.

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