Acoustic Scattering by Near-Surface Inhomogeneities in Porous Media

Abstract

A theoretical and experimental investigation into the influence of near-surface buried inhomogeneities on the reflection of air-borne acoustic fields at a porous ground surface has been conducted based on the assumption that the ground supports only one wave type. Two theoretical treatments of this problem are presented, both involving reformulations of initial boundary value problems as boundary integral equations. Predictions of these formulations are compared with each other and with experimental data. The theoretical models enable constraints and possibilities to be discussed in the context of use of level difference spectra for acoustic detection of surface and sub-surface inhomogeneities. A final appendix is concerned with a theoretical study of surface waves on proelastic surfaces. Keywords: Acoustic scattering; Boundary elements; Surface waves; Reflection; Transmission.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Feb 21, 1990
Accession Number
ADA222625

Entities

People

  • David L. Berry
  • Keith Attenborough
  • Yu Chen

Organizations

  • The Open University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Acoustic Propagation
  • Acoustic Properties
  • Acoustic Scattering
  • Acoustic Waves
  • Acoustics
  • Anechoic Chambers
  • Boundary Value Problems
  • Cartesian Coordinates
  • Computational Fluid Dynamics
  • Computational Science
  • Equations Of Motion
  • Integral Equations
  • Measurement
  • Mechanics
  • Rayleigh Waves
  • Scattering
  • Wave Propagation

Fields of Study

  • Physics

Readers

  • Coastal Oceanography
  • Computational Modeling and Simulation
  • Wave Propagation and Nonlinear Chaotic Dynamics.