基于激光超声可视化的厚壁管内壁缺陷无损检测  

Nondestructive Testing Cracks on Inner Surface of Thick Pipes by Laser Ultrasonic Visualization

作　　者：詹超 彭笑永 李阳[2] Zhan Chao;Peng Xiaoyong;Li Yang(Zhuhai Branch,Guangdong Institute of Special Equipment Inspection and Research,Zhuhai,Guangdong 519002,China;School of Mechanical Engineering,Zhengzhou University,Zhengzhou,Henan 450001,China)

机构地区：[1]广东省特种设备检测研究院珠海检测院,广东珠海519002 [2]郑州大学机械工程学院,河南郑州450001

出　　处：《激光与光电子学进展》2021年第6期364-370,共7页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(51705470);河南省重点研发与推广专项(182102210009);广东省特检院2017年度院级立项科技项目(2017CY07);河南省教育厅-河南省高等学校重点科研项目(18A460032);郑州大学青年骨干教师培养计划。

摘　　要：采用一种斜入射纵波探头在管内壁上形成爬波,以达到检测厚壁管内壁缺陷的目的。首先采用有限元方法模拟斜入射纵波在内壁上形成爬波的过程;然后使用激光超声可视化技术观察爬波在内壁上的形成过程,以验证有限元仿真的结果;最后通过超声波探伤仪连接研制的爬波探头,得到爬波在内壁人工缺陷上的反射信号。实验结果表明,超声纵波在管内壁上发生模态转换形成爬波,而爬波能量和纵波的入射角有关;探头和缺陷之间的距离影响着缺陷反射信号的幅值和出现时间;纵波在内壁上只是部分转换为爬波,还存在其他模态的超声波。试制的爬波探头可有效地检测厚壁管的内壁缺陷,为保障厚壁管的运行安全提供有效的无损检测方法。An oblique incident longitudinal wave probe is used to form creeping waves on the inner wall of the tube to achieve the purpose of detecting defects on the inner wall of the thick-walled tube.First,the finite element method is used to simulate the creeping wave formation process on the inner wall of the obliquely incident longitudinal wave.Then,the laser ultrasonic visualization technology is used to observe the creeping wave formation process on the inner wall to verify the results of the finite element simulation.Finally,the developed ultrasonic flaw detector is connected the creeping wave probe obtains the reflected signal of the creeping wave on the artificial defect on the inner wall.The experimental results show that the ultrasonic longitudinal wave undergoes modal conversion on the inner wall of the tube to form a creeping wave.The creeping wave energy is related to the incident angle of the longitudinal wave.The distance between the probe and the defect affects the amplitude and time of the defect reflection signal.Longitudinal waves are only partially converted into creeping waves on the inner wall and there are other modes of ultrasound.The trial-produced creeping wave probe can effectively detect the inner wall defects of thick walled pipes and provide an effective non destructive testing method to ensure the safe operation of thickwalled pipes.

关 键 词：传感器 激光超声 爬波 厚壁管 有限元模拟 模态转换 

分 类 号：TN247[电子电信—物理电子学] TB551[理学—物理]