Electromagnetic Acoustic Transducer

Abstract

As an important branch of the nondestructive testing field, ultrasonic testing is widely used in the industries of steel, electricity, petroleum, transportation, and medical and others. In the process of ultrasonic testing, the ultrasonic transducer is the core component of the excitation and reception of ultrasonic waves, mainly including the piezoelectric ultrasonic transducer and the electromagnetic acoustic transducer (EMAT). Compared with the piezoelectric ultrasonic transducer, EMAT has many advantages, such as being non-contact, no need for the coupling medium, and easy to produce the shear horizontal wave. In particular, it can be applied under a high-temperature environment, or when an isolation layer exists, and other special applications. It possesses a crucial application value and widespread application prospects.