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一、前言近年来,干涉技术已不断扩大应用范围,测量超声换能器的声学数据和由它们产生的辐射图形以及显示生物体和物质组织。1974年Mezrich 等报导了研究显示生物组织的系统,以及超声波的产生和传播的基础研究。上述系统受到超声位移的阻制,超声位移比光波波长还小。激励参考棱镜(摆动物)作频率低于信号频率的振动,用以消除环境干扰。这
I. INTRODUCTION In recent years, interference technology has been expanding its scope of application to measure the acoustic data of ultrasonic transducers and the radiation patterns generated by them as well as the display of biological and material tissues. In 1974, Mezrich et al. Reported on studies showing the biological tissue system and basic research on the generation and propagation of ultrasound. The above system is hindered by the ultrasonic displacement and the ultrasonic displacement is smaller than the wavelength of the light. Excitation reference prism (pendulum) as the vibration frequency lower than the frequency of the signal to eliminate environmental interference. This