Acoustic nackscatter from a random rough water surface
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Authors
Ball, Ernest Charles
Carlson, John Algot
Subjects
Scattering
Backscattering
Acoustic scattering
Rough water surface
Wave height distribution
Wave slope distribution
Wave spectra
Surface reverberation
Doppler shift
Backscattering
Acoustic scattering
Rough water surface
Wave height distribution
Wave slope distribution
Wave spectra
Surface reverberation
Doppler shift
Advisors
Medwin, Herman
Date of Issue
1967-06
Date
June 1967
Publisher
Monterey, California. U.S. Naval Postgraduate School
Language
en_US
Abstract
Acoustic backscattering from a random rough water surface has been studied experimentally to test the application of two scattering theories, a statistical description and a resonance approach. The rough surface was created by wind agitation over an anechoic tank. The wave height distribution was measured with a resistive probe and the wave slope distribution by optical glitter detection using a photocell. The distributions of backscattered sound pressures were recorded for surface roughnesses and sound frequencies corresponding to a very wide range of roughness conditions. Both statistical and resonance theories have regions of applicability and regions where they fail to predict the backscatter. Backscattering may be considered to be due to these two mechanisms, since a summation of the predictions of the two theories fits the experimental data fairly well over the complete range of angles of incidence studied. A method of analysis is suggested to relate the doppler shifted continuous wave sound spectrum to the surface wave spectrum.
Type
Thesis
Description
Series/Report No
Department
Department of Physics
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
Sponsors
Funding
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
Copyright is reserved by the copyright owner
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.
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.