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Frequency-time correlation of surface scattered underwater sound.

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Author
Loomis, Michael Francis
Date
1976-12
Advisor
Medwin, H.
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Abstract
The wind driven surface of a large anechoic tank was used to study forward scattered underwater sound. A 10 kHz saw-tooth signal was used to drive an omnidirectional source to insonify the rough surface. Direct and reflected path sound signals to a point hydrophone were separated by appropriate gating and the reflected path signal was analyzed for up to 2 minutes at 10 and 20 msec, intervals, using digital FFT spectral analysis. Graphs of sound pressure level vs. time for every 10 kHz from 30 kHz to 120 kHz (Surface roughnesses between 1.1 and 10.5) are shown. Correlation of the scattered sound pressure with frequency was analyzed. Evidence is presented to support the hypothesis that, for large roughnesses, the instantaneous scattered sound amplitudes are harmonic functions of sound frequency; that is, there is a consistent frequency separation between instantaneous amplitude maxima at one frequency and minima at another frequency.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
URI
http://hdl.handle.net/10945/17787
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  • 1. Thesis and Dissertation Collection, all items

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