A Low-Frequency, Tow-Powered Sound Source
NAVAL RESEARCH LAB ORLANDO FL UNDERWATER SOUND REFERENCE DETACHMENT
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This paper discusses resonant cavities and their potential sound pressure output when they are modulated hydrodynamically. Rough calculations show that in the frequency range of 10 to 100 Hz source levels in excess of 200 dB re 1 micro Pa should be achievable. Experimental data from three suboptimum devices showed source levels of 182 dB at 16.6 and 50 Hz and 168 dB at 34.5 Hz. It is expected that with appropriate designs one can achieve greater than 200 dB from 10 to 100 Hz with fairly small, lightweight devices. Further, with innovative designs one should be able to obtain frequency diversity and perhaps broad bandwidth with a single device.