CLASSIFYING DEFECTS IN STRUCTURAL MATERIALS PURSUANT TO DETECTION BY MEANS OF ULTRASONICS

摘要

D-6689 CLASSIFYING DEFECTS IN STRUCTURAL MATERIALS PURSUANT TO DETECTION BY MEANS OF ULTRASONICS The wave form of an ultrasonic flaw echo is analyzed by generating from the signal a complex signal function and determining the location of the peak in the complex function plane. The angle of the vector representing the peak is normalized by means of analogously processing reference echos, and the normalized peak displacement angle is used as discriminating criterion to separate harmless errors from harmful ones.