Abstract
The method of Laser Doppler Anemometry (LDA) is applied to the measurement of particle velocity in a hydroacoustic field. The field is created in a USRD type G19 or G40 calibrator. The LDA results are compared with the values for the velocity obtained from the pressure gradient measured by a USRD standard hydrophone. The anemometer is operated in forward scattering mode, and also in backscattering mode through the use of a fiber‐optic transducer. Seeding particles of varying material and size are dispersed in the acoustic medium (water). The influence of these parameters including the particle concentration on the signal quality and detection threshold is discussed. [Work supported by ONR.]
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