METHOD FOR DISTINGUISHING BETWEEN INTERFERING SIGNALS AND SIGNALS INDICATING DEFECTS OF WORKPIECES DURING ULTRASONIC TESTING

摘要

In order to reliably exclude interfering signals caused by disturbances such as air bubbles existing in a coupling medium from signals generated by workpiece defects in the ultrasonic testing of workpieces according to the pulse-echo-method, at the appearance of a signal in the time between transmitting pulse and surface echo-signal crossing an adjustable threshold during a test cycle, all signals of the same test cycle falling within the range of anticipation for workpiece defects are suppressed.