Document Type

Article

Publication Date

10-1983

Journal or Book Title

Journal of the Acoustical Society of America

Volume

74

Issue

4

First Page

1279

Last Page

1290

DOI

10.1121/1.390045

Abstract

The relationship between scattering data obtained from ultrasonic experiments, in which the waves are excited and detected in a finite measurement geometry, and unbounded medium, farfield scattering amplitudes is considered. For a scatterer in a single fluid medium, a Green’s function approach is used to develop an approximate, but absolute, relationship between these experimental and theoretical cases. Electromechanical reciprocity relationships are then employed to generalize to a two medium case in which the scatterer is located in an elastic solid which, along with the ultrasonic transducer, is immersed in a fluid medium. The case explicitly considered is one in which the incident waves are quasiplanar over the volume of the flaw and the scattering amplitudes are slowly varying over the range of angles subtended by the receiving transducer. Analytic approximations are developed for the absolute relationship of the received transducer signal to the unbounded medium scattering amplitudes, and formal expressions for the error terms are presented. Preliminary experimental confirmation is reported for the cases of (1) LL and TT pulse–echo scattering from oblate spheroidal voids and (2) both pulse–echo and pitch–catch LL scattering from spherical inclusions. With no adjustable parameters, good agreement for both the phase and absolute amplitude response is observed.

Comments

This article is from Journal of the Acoustical Society of America 74, no. 4 (1983): 1279–1290, doi:10.1121/1.390045.

Copyright Owner

Acoustical Society of America

Language

en

File Format

application/pdf

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