Accession Number : ADP000342

Title :   The Bojarski-Lewis Identify for Elastic Wave Scattering,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s) : Lee,D. A.

Report Date : JUN 1982

Pagination or Media Count : 48

Abstract : In 1967 N. N. Bojarski published a remarkable identify, which showed that the physical optics approximation to the far-field back-scattered radiation generated by plane electromagnetic waves incident on a convex, perfectly conducting body could be processed simply to give the Fourier transform of the characteristic function of the body. (A body's characteristic function has the value 1 at all points inside the body, and is zero everywhere else.) R. M. Lewis explored the identity's implications. With the current interest in sophisticated ultrasonic inspection, it is natural to ask if an identify like the Bojarski-Lewis identity holds for elastic wave scattering. Elastic wave scattering is, of course, complicated by the existence of two different kinds of elastic waves, while electromagnetic scattering involves waves of just one kind. The present paper shows that an extension of the Bojarski-Lewis identity does indeed hold for elastic wave scattering, and discusses ways of applying this result in non-destructive testing. (Author)

Descriptors :   *Elastic waves, *Elastic scattering, *Optics, Nondestructive testing

Distribution Statement : APPROVED FOR PUBLIC RELEASE