【摘要】 我们介绍了一种新颖的超声波检测技术，它用宽带，非接触的电容换能器实现超声波的激发或接收。文中简要叙述了换能器的工作原理与构成，给出了测量系统的设计与工作流程，并对主要的超声波发射与接收电路作了说明。用该系统可进行超声波速度与衰减的精密测量，还可检测到脉冲激光激发的瞬态弹性波。更多还原

【Abstract】 We describe a new ultrasonic sensing technique which uses broadband and noncontact capacitive transducer to generate or receive ultrasonic waves. The principle and construction of the transducer are briefly presented and the working principle,design of the system as well as the main generator and detector circuit are introduced in the paper. With this system,the laser generated elastic transient waves can also be detected.更多还原