Abstract
The sample volume of continuous and pulsed ultrasonic Doppler velocity detectors can be examined using a small underwater jet. A test probe (line of velocity) is formed by the jet when it is seeded with silicone antifoam emulsion. A novel collection tube downstream from the nozzle prevents the spent scatters from contaminating the test tank. Studies are conducted by pointing the sound beam at the jet and moving the transducer and, in addition, for the pulsed Doppler, the range gate. The amplitude of the detected Doppler signal against range is then plotted. A method for determining the length of the sample volume from these plots is shown.
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