Electromagnetic Acoustic Transducer can realize electromagnetic -ultrasonic transduction without contact. Electromgnetic acoustic transducer has advantages over conventional piezoelectric transducer in testing roughness surface.

• 电磁声传感器是一种非接触式的电磁能与声能的换能装置,象运动圆环链这类带有锈蚀的粗糙表面上,常规的压电晶体传感器无法使用的场合,电磁声传感器充分显示出了它的优越性。