An application of Wiener filtering to nondestructive evaluation

15 October 1978

journal article
research article
Published by AIP Publishing in Applied Physics Letters

Vol. 33 (8) , 685-687
https://doi.org/10.1063/1.90529

Abstract

The inverse problem of defect characterization is carried out by comparing theoretical and experimental return echo pulses. Acoustic echo signals of the order of 2 ns long are digitized and fed into a digital computer. A Wiener filter is designed to match the transducer response, so the impulse response of the system approaches a δ function. Experimental results on defects in Si₃N₄ ceramics are presented which demonstrate the power of such a technique for defect characterization.

Keywords

WIENER FILTER
INVERSE PROBLEM
AUTOMATIC TEST EQUIPMENT
NONDESTRUCTIVE EVALUATION
IMPULSE RESPONSE
NONDESTRUCTIVE TESTING
FREQUENCY RESPONSE

This publication has 2 references indexed in Scilit:

The application of reciprocity theory to scattering of acoustic waves by flaws
Journal of Applied Physics, 1978
Acoustic pulse echo measurements at 200 MHz
Applied Physics Letters, 1977