Abstract
A bubblemaker (which operates by regulating a transient volume of air stored in a chamber placed between two solenoid valves) is the heart of an experimental apparatus used to generate a transient bubble cloud in water. The apparatus can be adjusted to create a cylindrical bubble column terminating at the air‐water interface. Sound pulses are generated by a circular plane array “transmitting” transducer driven by an electronic tone burst generator. Backscattering, at the angle θ = 180°, from the cloud is measured by a receiving transducer. Results are displayed to show any difference measured between scattering by the transient cloud and by the cylindrical column. [Work supported by the Naval Academy Research Council and by the National Center for Physical Acoustics.]
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