Method of non-destructive determination of material condition in components

摘要

The method involves stimulating a vibration at a first measurement point on the object (1)surface using an ultrasonic transmitter transducer (11), measuring vibrations at a second measurement point using an ultrasonic receiver transducer (14) and comparing with the stimulated vibration to detect a difference characteristic of the material's state. The vibrations are stimulated with a different frequency in several successive test cycles so as to change the depth of penetration of the vibrations for each test cycle. The ultrasonic receiver transducer detects the vibrations for each frequency.