为了实现对超声场的非接触全场测量和成像, 提出了基于数字全息干涉的动态超声场的测量和成像方法。对超声场的测量进行理论分析, 研究了基于数字全息干涉技术的动态声场测量原理。同时, 针对不同时刻的动态声场, 研究了主要的测量流程和数据分析过程。在此基础上设计了基于脉冲激光器的反射式数字全息显微成像系统, 其中包括光学检测子系统、超声子系统和同步控制子系统。实验结果表明, 对于动态超声场, 可以在一个时间序列中, 对不同时刻的超声场进行测量和成像。同时, 文中设计了微缺陷试样, 利用动态超声场测量技术对微缺陷进行检测。实验结果表明, 文中所研究的动态声场测量方法和系统可以有效地识别出试件中微小的内部缺陷。

In order to measure and image the ultrasonic wavefield in the whole non-contact field, the dynamic ultrasonic wavefield measurement and imaging method based on digital holographic interference was proposed. Based on the theoretical analysis of ultrasonic wavefield measurement, the principle of ultrasonic wavefield measurement based on digital holographic interferometry was studied. At the same time, the main measuring process and data analysis process for different cross-sectional of dynamic ultrasonic wavefield were studied. The reflection type digital holography system based on pulsed laser was designed, including optical detection subsystem, ultrasonic subsystem and synchronization control subsystem. The experimental results show that the dynamic ultrasonic wavefield can be measured and imaged at different moments in a time series. At the same time, the micro-defect sample is designed and detected by dynamic ultrasonic wavefield measurement. The experimental results show that the dynamic ultrasonic wavefield measurement method and system studied in this paper can effectively identify the minor internal defects in the specimen.