Abstract
In the fall of 1991, Carey, Roy et al. conducted a series of experiments at the Seneca Lake test facility which measured the frequency-dependent scattering from submerged bubble clouds. Preliminary results reported by Roy et al. [J. Acoust. Soc. Am. 92, 2993–2995 (1992)] showed that certain features of the high-frequency backscatter data were consistent with single-bubble scattering while the low-frequency results were consistent with collective oscillations of the bubble cloud. A monopole resonance scattering peak was evident that scaled with the bubble cloud volume and the mixture sound speed. Additional analysis showed that the evolving target strength of the cloud as it rose through the insonating acoustic beam showed signs of an interference effect [Carey and Roy, Proc. 2nd Euro. Conf. on Underwater Acoust., European Commission, Luxembourg, 207 (1994)] which could explain the differences between calculated and measured scattering strengths. Advanced signal processing and modeling techniques have been developed to enable the removal of experimental artifacts caused by: (1) uncertainties in the range geometry, (2) coherent electrical noise in the processing electronics, and (3) acoustic reverberation within the test volume. The resulting corrected backscattering target strengths will be reported and discussed. [Work supported by ONR.]
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