A pulse electromagnetic acoustic transducer (pulse EMAT), with an induction coil replacing the conventional magnet, has been developed in order to increase transmission amplitude of ultrasonic waves. Us ing a pulse generator, a current of approximately 100 A was passed through the induction coil for 25 us, and a surface SH wave was transmitted during induction. As a result, the observed detection sign al for the pulse EMAT was 20% of that of an EMAT with a periodic permanent magnet (PPM) structure. The tim...
英字タイトル:
Development of EMAT with pulse electromagnet applied to condition based maintenance for constructive materials condition based maintenance for constructive materiais