Ultrasonic surface wave propagation and interaction with surface defects on rail track head

被引：89

作者：

Fan, Y. ^{[1
]}

Dixon, S. ^{[1
]}

Edwards, R. S. ^{[1
]}

Jian, X. ^{[1
]}

机构：

[1] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England

来源：

NDT & E INTERNATIONAL | 2007年 / 40卷 / 06期

关键词：

EMAT; ultrasound; rail; Rayleigh; surface defect;

D O I：

10.1016/j.ndteint.2007.01.008

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Electromagnetic acoustic transducers (EMATs) are non-contact ultrasonic transducers capable of generating wide band ultrasonic surface waves on metallic samples. A lab-based laser-EMAT system has been developed to observe the ultrasonic surface wave propagation and interaction with surface breaking defects on the sample rail head surface. A wide band EMAT generating surface waves with a frequency content between approximately 50 and 500 kHz is used to propagate ultrasonic waves on the surface of a rail head down the length of the sample. A stabilised Michelson interferometer is used to measure the out-of-plane displacement of the surface wave. A complete picture of the ultrasonic surface wave on the sample surface over time is reconstructed using this technique, with exceptionally high spatial and temporal resolution. Despite the curvature of the rail head, the ultrasonic surface wave propagating down the rail is found to have similar properties to Rayleigh waves by direct comparison to those observed on flat samples using the same technique. (c) 2007 Elsevier Ltd. All rights reserved.

引用

页码：471 / 477

页数：7

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