Accession Number:

ADA158070

Title:

The Experimental Investigation of the Inverse Problem in Rough Surface Scattering of Acoustic Waves.

Descriptive Note:

Technical rept.,

Corporate Author:

TEXAS UNIV AT AUSTIN APPLIED RESEARCH LABS

Personal Author(s):

Report Date:

1985-08-01

Pagination or Media Count:

100.0

Abstract:

This study represents an inverse problems approach to rough surface acoustical scattering, the objective being to infer certain statistical characteristics of a randomly rough surface directly from the coherently scattered pressure field. Eckarts physical-acoustical scattering model is applied to derive relationships for the probability density function and correlation function of surface heights which can be inferred directly from the scattered pressure field. Signal processing techniques are used to obtain estimates of the probability density function and correlation functions from experimental data. The experimental measurements are made of the steady-state complex scattered pressure field from a single frequency small beamwidth source incident upon a pressure release model rough surface. Comparisons are made between the characteristics inferred from the scattered pressure and the actual surface characteristics. The ability of the signal processing techniques to accurately predict the known characteristics is then evaluated. Keywords Forward scattering Inverse scattering Rms surfacce height Correlation length Discrete Fournier transform Bojarsky-Lewis method Extended Prony method Spectral estimation Power spectrum.

Subject Categories:

  • Statistics and Probability
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE