Rail inspection by using Laser-EMAT technology
(0) Laser generation and EMAT(electromagnetic acoustic transducer)detection were combined as a hybrid ultrasonic technique for the inspection of various defects in the rail.To evaluate the capability of laser-EMAT testing technique,rail samples with five kinds of artificial defects were prepared,including the surface crack,surface vertical hole,surface oblique hole,bolt hole crack and web hole.The surface flaws were detected by mode conversion between Surface wave and shear wave,while the internal flaws were inspected by the diffraction of shear wave.The technique of noise suppression based on wavelet softthreshold method(WSTM)was introduced to improve the testing accuracy and signal to noise ratio(SNR).Experimental results have shown the errors of testing these defects were all less than 10%,which proves laser-EMAT technique is very suitable to non-destructive assess the rail.
Laser ultrasonic Electromagnetic acoustic transducer Non-destructive testing Rail
Y.Zhao S.Malynk R.Guo Y.Ju
Laser institute,Qilu University of Technology(Shandong Academy of Sciences),China Paton Electric Welding Institute of the NAS of Ukraine,Kiev,Ukraine School of mechanical,Nagoya University,Nagoya,Japan
国际会议
The 7th World Conference on Structural Control and Monitoring(7WCSCM)(第七届结构控制与监测世界大会)
青岛
英文
1328-1334
2018-07-22（万方平台首次上网日期，不代表论文的发表时间）