Abstract

A method of flaw characterization based on time domain analysis of the diffracted sound field from a flaw when irradiated by short ultrasonic pulses is described. The echo formation mechanism developed by Freedman has been utilized to predict the return pulse pattern. Experimental results that are in good agreement with theoretical predictions are presented. Using a microcomputer-based scanning and testing system the feasibility of reproducing planar, straight-edged flaw shapes has been successfully demonstrated.

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