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。 We introduced a novel ultrasonic inspection technique that uses ultrasonic, wide-band, noncontact, capacitive transducers to excite or receive ultrasound. This paper briefly describes the working principle and structure of the transducer, gives the design of the measurement system and workflow, and describes the main ultrasonic transmitting and receiving circuits. The system enables precise measurements of ultrasonic velocity and attenuation, as well as transient elastic waves excited by pulsed lasers.