基于多普勒效应的超声波测振系统设计

Design of Ultrasonic System for Vibration Measurement Based on Doppler Effect

连续超声波束遇到振动物体表面会产生多普勒效应,文中据此设计了超声波测振系统,其主要由超声波发射接收模块、数据采集和信号处理模块等组成。发射探头发出超声波后,接收探头获得由振动物体表面反射的超声波信号,通过数据采集卡转换为数字信号,再采用微分鉴相方法获取原振动信号,实现物体的振动测量。最后,对该超声波测振系统进行了实验,结果证实了该超声波测振系统的有效性。

The ultrasonic system was designed for vibration measurement Doppler effect occurring when continuous ultrasonic beam encountered the surface of vibrating object. The system was composed of ultrasonic transmitting and receiving module and signal acquisition,processing and analysis module. The ultrasound was transmitted by the ultrasonic transmitting probe. The ultrasonic signal reflected from the surface was received by the ultrasonic receiving probe and the reflected ultrasonic signal was converted to the digital signal through the data acquisition card. Then the digital signal was processed through differential phase demodulation to obtain the original vibration signal. Finally,the ultrasonic system for vibration measurement was tested,and the validity of the system was confirmed.