Abstract
Sound of short wavelength (18 in. in water) is caused to travel a pathlength that is varied periodically. Velocity of phase propagation in the fluid is inversely proportional to the total phase difference over minimum and maximum pathlengths. With the aid of quadrature processing and phase comparison between sent and received signals, the total phase angle can be read from an oscilloscopic display, or converted by digital processing to a direct velocity readout.
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