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In-plane and out-of-plane measurements of Rayleigh waves using EMATs for characterising surface cracks

机译：使用EMAT进行瑞利波的面内和面外测量以表征表面裂纹

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摘要

Electromagnetic acoustic transducers (EMATs) have been used to measure the properties of Rayleigh waves in the vicinity of defects propagating at different angles to the sample surface, which are more representative of real defects than slots machined normal to the surface. Transmission measurements show that one must consider the angle of the defect when choosing a depth calibration curve. We propose a procedure for crack characterisation (depth, angle) that considers transmission alongside measurements of both the in-plane and out-of-plane velocity components of the Rayleigh wave in the near-field of a defect, where the signal is enhanced due to constructive interference of incident and reflected wavemodes, and/or mode conversion. This procedure uses image analysis of B-scans alongside the ratio of the enhancement in the in-plane to the out-of-plane components to characterise the angle. Once this is known the correct transmission depth calibration curve can be used. The procedure shows very good agreement between the measured and the actual slot characteristics on test samples.
机译：电磁声换能器（EMAT）已用于测量以与样品表面不同角度传播的缺陷附近的瑞利波的性能，与垂直于表面垂直加工的缝隙相比，该缺陷更能代表实际缺陷。透射测量结果表明，选择深度校准曲线时必须考虑缺陷的角度。我们提出了一种裂纹表征（深度，角度）的程序，该程序应考虑到缺陷附近区域中瑞利波的面内和面外速度分量的测量以及传输的同时进行传输对入射和反射波模和/或模式转换的相长干涉。此过程使用B扫描的图像分析以及平面内和平面外分量的增强比来表征角度。一旦知道这一点，就可以使用正确的透射深度校准曲线。该程序显示了测试样品上的实测槽缝特性与实际槽缝特性非常吻合。

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  • 来源
    《NDT & E international》 |2012年第2012期|p.1-9|共9页
  • 作者

    M.H. Rosli; R.S. Edwards; Y. Fan;

  • 作者单位

    Department of Physics, University of Warwick, Coventry CV4 7AL, UK;

    Department of Physics, University of Warwick, Coventry CV4 7AL, UK;

    Department of Physics, University of Warwick, Coventry CV4 7AL, UK;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ultrasound; defect characterization; rayleigh wave; EMATs;

    机译：超声波缺陷表征;瑞利波EMAT;

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