最近提出的光学探测系统利用两台激光器,海瑞金刚石实验室研制的探测系统可进行遥控,对试样大小和形状限制较少,使该系统比利用压电传感器的传统系统(是复杂而又耗时的方法)通用得多。该系统利用一台高功率脉冲激光器在固体材料中产生声波,用另一台激光器记录由声波产生的表面移动(见图)。激光脉冲在试样中产生的声波作为纵向压力波传播。当压力波冲击到边界时,例如裂纹,由于压力波被边界反射,试样的表面就发生位移。边界表面的移动可用光学的方法利用与干涉仪和某种类型的信息处理一起运转的激光束来探测。用于裂纹探测的两种可供选用的工具 Recently proposed optical detection system using two lasers, the detection system developed by the Hai Rui diamond laboratory remote control, the sample size and shape less restrictive, the system than the use of piezoelectric sensors in the traditional system (is complicated Time-consuming method) is much more common. The system uses a high-power pulsed laser to generate sound waves in a solid material and a second laser to record the surface movement caused by sound waves (see photo). Laser pulses The acoustic waves generated in the specimen propagate as longitudinal pressure waves. When the pressure wave hits the boundary, such as a crack, the surface of the sample is displaced because the pressure wave is reflected by the boundary. The movement of the boundary surface can be detected optically using a laser beam that operates with an interferometer and some type of information processing. Two optional tools for crack detection