Study of a new inspection system of a pipe using a piezoelectric ultrasonic sensor and an electromagnetic induction coil

点击翻译按钮获取中文摘要

The new sensor system by combining of a piezoelectric thin-film multilayer ultrasonic element and an electromagnetic induction coil could be driven from 20cm far exceeding the sensor by using a drive equipment which consists of an electromagnetic induction coil and a high power electric transmitting device, as a result of electromagnetic induction coil specification optimization. Then there was no change in the detection sensitivity, when the high temperature experiment up to 400 degrees is conducted and only a coil's is heated. Next, when a piezoelectric thin film type ultrasonic sensor was heated simultaneously, the sensitivity fell down, but the sufficient receiving signal intensity was obtained. Next, it was possible to successfully receive a guided wave by electromagnetic induction method by attaching a piezoelectric transducer at regular intervals on test the pipe to circumferential direction to detect the through-holes of 10mm diameter.