Krautkramer Branson, Inc.

Udo Schlengermann

Joseph L Rose

Ludwig Niklas

In a pulse-echo ultrasonic test arrangement the back reflected echo acoustic wave signal as well as the scattered longitudinal wave and scattered shear wave signals are utilized in an evaluation circuit for determining more accurately the characteristics of a defect in a workpiece. The evaluation circuit, most suitably, includes a digital computer which in a typical embodiment of the invention is programmed to provide by Fourier transforms the frequency amplitude spectrum and the frequency phase spectrum of the supplied three signals, hence producing six characteristic outputs for a particular defect.

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Hurth-Hermulheim, Germany

Udo Schlengermann