Controllability over the transient performances of piezoelectric transducers used in ultrasonic testing

The transient performances of piezoelectric transducers used in ultrasonic tes- ting mainly include transient spatial response and transient time response.This paper pres- ents the ways to control and adjust the transient performances through changing the trans- ducer structure and the exciting source.For the transient spatial response,it is possible to obtain a parallel acoustic beam by eliminating the edge wave,and a long axis focusing beam by eliminating the plane wave.For the transient time response,the first-second cycle amplitude ratio can be adjusted by changing the impedance of the transducer backing, while any arbitrary testing signal can be obtained by changing the transducer structure and the exciting signal.