The diagnosis of material degradation and the detection of defects in cast duplex stainless steel have been studied using ultrasonic techniques. This paper describes an electromagnetic micro sensor consisting of a coil and ferrite core as a transducer for detecting ultrasonic waves. When this sensor is used In combination with the ultrasonic transmitter, it can detect the electromotive force caused by the oscillation at the surface of the material. Results demonstrating the ability of the transducers are presented.
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