基于光纤传导的钢轨踏面缺陷激光声磁检测  

Laser-EMA ultrasonic detection of the flaws on rail tread based on fiber conduction

作　　者：孙继华[1] 赵扬[1] 马健[1] 南钢洋[1] 宋江峰[1] 郭锐[1] 刘帅[1] 

机构地区：[1]山东省科学院激光研究所山东省无损检测工程技术研究中心,山东济南250014

出　　处：《光电子．激光》2016年第11期1176-1180,共5页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(51205240);山东省科学院杰出青年计划(201505);济南市高校自主创新基金(201402008;201402019)资助项目

摘　　要：针对较容易产生缺陷的钢轨踏面检测要求,建立了基于光纤传导技术的钢轨踏面裂纹缺陷激光声磁检测(EMAT)系统。系统通过光纤传导脉冲激光照射到钢轨踏面激发出超声表面波,表面波在传播过程中遇到钢轨踏面缺陷时发生模式转换成横波,再使用电磁超声技术接收超声转换成横波信号。通过本文系统对钢轨试样不同位置进行扫查,能精确检测出钢轨踏面裂纹缺陷。实验结果表明,本文系统具有非接触、结构灵活和灵敏度高等优点,可实现钢轨踏面裂纹缺陷的有效检测。In accordance to the testing requirement of the flaws on rail tread,the laser- electro magnetic acoustic （EMA） testing system based on fiber conduction is es tablished to test the flaws on rail tread.The system can generate ultrasonic surface wave on rail tread by laser pulse.It is known that shear wav e component which can be received by EMA technology can be produced due to the mode conversion when the ultras onic surface wave is transmitted through the surface crack.The system can precisely test the flaws by inspecting the rail.T he experimental research shows that this system can effectively test the flaws on rail tread,and has advantage s of non-contact,flexible structure and high sensitivity.

关 键 词：光纤传导 激光声磁(EMA) 钢轨 踏面缺陷 

分 类 号：TN249[电子电信—物理电子学] U216.3[交通运输工程—道路与铁道工程]