ULTRASONIC FLAW DETECTOR FOR INSPECTING PLATEELIKE OBJECTS*PARTICULARLY STRIPS BY USING LAMBERT WAVE PULSE ECHO METHOD

摘要

The ultrasonic testing device is for metal strips. It uses a method based on pulse-echo testing by Lamb waves, and consists of an ultrasonic test head with a sender receiver and oscillators. The sender (2) consists of a number of oscillators (6a-f) allocated to different strip thickness range. They have different, constant frequencies, and the product of frequency by the allocated strip thickness is the same for all of them (6a-f).