All-optical laser-ultrasonic technology for width and depth gauging of rectangular surface-breaking defects

光学 激光器 波长 材料科学 超声波传感器 瑞利波 GSM演进的增强数据速率 瑞利散射 瑞利长度 声学 表面波 光电子学 物理 激光束 电信 计算机科学
作者
Chaohua Cheng,Bing‐Feng Ju,Xiaoyu Yang,Chuanyong Wang,Anyu Sun,Jinlu Gong,Zhihong Li
出处
期刊:Review of Scientific Instruments [American Institute of Physics]
卷期号:92 (5) 被引量:8
标识
DOI:10.1063/5.0026174
摘要

In this paper, the width and depth of rectangular surface-breaking defects were successfully gauged using an all-optical laser-ultrasonic system. The finite element method was used to simulate propagating paths of defect-induced reflected and transmitted Rayleigh waves. It is observed that most Rayleigh waves with wavelengths less than the depth of the defect are reflected by the defect. A small part of the Rayleigh waves with wavelengths greater than the depth of the defect directly transmits through the bottom edge of the defect without acting on the left edge of the defect. Based on the simulation results, a three-step detection method of width and depth gauging of rectangular surface-breaking defects is proposed. In the first step, the pulsed laser and detection laser are irradiated on one side of the defect. In the second step, the sample is moved to a certain distance to ensure that both lasers reach the other side of the defect. In the third step, two lasers are irradiated on both sides of the defect. The width and depth of the defect are calculated according to the arrival time of the incident, reflected, and transmitted Rayleigh waves, as well as the movement distance of the sample. Experimental results are consistent with the reference-results measured by using a digital microscope. The proposed three-step detection method is proved to be feasible in simultaneous measurement of the width and depth of rectangular surface-breaking defects. Furthermore, it may be potentially useful for measuring other types of defect structures.
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