Investigation of the technique of ultrasonic thickness control using the EMA method

Abstract

Experimental studies of the electromagnetic-acoustic (EMA) method for controlling the thickness of sheets, metalware, equipment, and pipelines were performed. New methods for the measurement of ultrasonic thickness that provide thickness control without cleaning the contact surface of a tested object and without using contact greases, as is required when using conventional contact ultrasonic transducers, are shown. On the basis of these studies and the experience of ultrasonic thickness gauging (USTG) by the contact and EMA methods, a USTG technology that uses the EMA method has been developed.