Accession Number : AD0760306

Title :   Coherent and Incoherent Components of Sound Scattered at a Time Dependent Rough Surface,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s) : Clay,Clarence S.

Report Date : 31 DEC 1972

Pagination or Media Count : 35

Abstract : Theoretical expressions are derived for the sound scattered at a time-dependent rough surface. The calculations are made for a Gaussian shaded source transducer and point receiver. The Helmholtz theorem and Fresnel approximation are used. The rough surface is assumed to be a traveling wave and to have a traveling wave packet type of correlation function. The coherent component of the signal is the product of the Fourier transformation of the surface distribution function and the smooth surface reflection signal. Comparison of theory and experiment shows the coherent component to be sensitive to the non-Gaussian character of the wind-blown water waves. The incoherent components and the temporal correlation function of the scattered sound are given. (Author Modified Abstract)

Descriptors :   (*ACOUSTIC SIGNALS, WATER WAVES), APPROXIMATION(MATHEMATICS), PARTIAL DIFFERENTIAL EQUATIONS, TRANSCENDENTAL FUNCTIONS, PROBABILITY DENSITY FUNCTIONS, CURVE FITTING, GRAPHICS

Subject Categories : Acoustic Detection and Detectors
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE