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Signal Processing in Ultrasonic NDE (Nondestructive Evaluation)
Final technical rept. 15 Aug 1984-14 Nov 1985
KENTUCKY UNIV LEXINGTON WENNER-GREN RESEARCH LAB
Pagination or Media Count:
The desirable performance goal of an ultrasonic nondestructive evaluation, NDE, methodology is to reliable and rapidly obtain information regarding flaws in the material being tested. Decisions concerning acceptance rejection of material for further usage can then be made on the basis of the nature and severity of flaws within it. Flaw size estimates are currently made on the basis of an idealized physical model, describing the flaw, which uses the computed impulse response as an input. The research reported in this study seeks to define the limits and sensitivities of currently available deconvolution algorithms. In particular, the interrelationship among parameters of deconvolution procedures, noise, transducer bandwidth and instrumentation related errors were studied. Simulation experiments dealing with the impulse train recovery from material samples are illustrated in an algorithmic manner with the aid of a laboratory minicomputer system.
APPROVED FOR PUBLIC RELEASE