测试技术学报2018，Vol.32Issue(1)：81-85,5.DOI:10.3969/j.issn.1671-7449.2018.01.016
针对金属表面缺陷深度的激光超声检测研究
Study on Laser Ultrasonic Technology for Depth Detection of Metal Surface Defects
摘要
Abstract
In order to detect the depths of surface defect,this paper presented a method for detecting surface defect depth by using amplitude analysis.The B-scan signal was collected by laser scanning method with the experimental platform of laser ultrasonic,and analyzed the influence of surface defects at different depths on propagation of surface acoustic wave analyzed from the time and frequency do-main.The results show that:surface wave can be reflected、transmitted and converted to longitudinal wave and transverse wave at surface defect,and the frequency component of transmission wave is related to the defect depth;The amplitude ratio of transmission surface wave and surface wave can complete the depth detection of surface defects,and it is less error by comparing with the method of analyzing spectral components of transmitted surface waves.关键词
激光超声/表面缺陷/深度检测/声表面波/幅值分析法Key words
laser ultrasonic/surface defect/depth detection/surface acoustic wave/amplitude analysis method分类
信息技术与安全科学引用本文复制引用
李巧霞,李海洋,王召巴,白桦..针对金属表面缺陷深度的激光超声检测研究[J].测试技术学报,2018,32(1):81-85,5.基金项目
国家自然科学青年基金资助项目(11604304) （11604304）
山西省重点研发计划资助项目(201603D121006-1) （201603D121006-1）
