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<p>An acoustic system was designed to investigate microbubble concentrations and distributions in the ocean. The system consisted of a one-dimensional standing-wave resonator and a reverberation sensor. Concentrations are determined by measurement of the variation in system Q and the change in reverberation level produced by the resonant bubble response. The resonator and the sensor, while functioning independently, both measure bubble concentration as a function of depth and inferred size and thus provide a unique data comparison. The system has been designed to measure bubbles from approximately 700 microns to 30 microns utilizing frequencies from 5 tp 100 kHz at depths to 100 ft. Initial tests utilizing a bubble generator in an anechoic tank have demonstrated the system's capability to measure bubble concentrations.
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<br>Subjects: Physics; Resonant; Microbubbles; Standing wave; Reverberation; Acoustic</div>
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<dl><dd>Donaldson, William Jay</dd>
<dd>MacFarlane, Byron Noble</dd></dl></div>
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