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首页> 外文期刊>NDT & E international >2D surface defect images applying Tikhonov regularized inversion and ECT
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2D surface defect images applying Tikhonov regularized inversion and ECT

机译：应用Tikhonov正则化反演和ECT的2D表面缺陷图像

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摘要

This paper presents an inversion problem solution to obtain the geometrical profile of defects in a 2D surface view using an eddy current method with sinusoidal excitation. The inversion model deals with the perturbation of the eddy currents when a spatially uniform excitation magnetic field distribution is imposed in the vicinity of a metal surface. An adequate experimental setup was used to measure the magnetic field around a crack region. A planar excitation coil was used to generate the uniform magnetic field distribution around the points under measurement, and a giant magneto-resistance (GMR) was used as a sensing element. Tikhonov regularization was applied to the inversion problem algorithm. Five different geometric defects machined in an aluminum plate were tested experimentally using the inversion algorithm. Finite element simulations are provided to validate the 2D eddy current density images obtained by the regularized inversion process.
机译：本文提出了一种反问题解决方案，可使用正弦激励的涡流方法在二维表面视图中获得缺陷的几何轮廓。当在金属表面附近施加空间均匀的激励磁场分布时，反演模型处理涡流的扰动。适当的实验装置用于测量裂纹区域周围的磁场。使用平面励磁线圈在被测点周围产生均匀的磁场分布，并使用巨磁阻（GMR）作为传感元件。将Tikhonov正则化应用于反演问题算法。使用反演算法对铝板上加工的五个不同几何缺陷进行了实验测试。提供有限元模拟以验证通过正则化反演过程获得的2D涡流密度图像。

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  • 来源
    《NDT & E international》 |2016年第6期|48-57|共10页
  • 作者

    D.J. Pasadas; A.L. Ribeiro; T. Rocha; H.G. Ramos;

  • 作者单位

    Instituto Superior Tecnico, Av. Rovisco Pais, 1049-001 Lisbon, Portugal,Instituto de Telecomunicacoes, IST, Av. Rovisco Pais, 1, 1049-001 Lisbon, Portugal;

    Instituto Superior Tecnico, Av. Rovisco Pais, 1049-001 Lisbon, Portugal,Instituto de Telecomunicacoes, IST, Av. Rovisco Pais, 1, 1049-001 Lisbon, Portugal;

    Instituto Superior Tecnico, Av. Rovisco Pais, 1049-001 Lisbon, Portugal,Instituto de Telecomunicacoes, IST, Av. Rovisco Pais, 1, 1049-001 Lisbon, Portugal;

    Instituto Superior Tecnico, Av. Rovisco Pais, 1049-001 Lisbon, Portugal,Instituto de Telecomunicacoes, IST, Av. Rovisco Pais, 1, 1049-001 Lisbon, Portugal;

  • 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

    Eddy current testing; Crack; Geometrical characterization; Inverse problem; Tikhonov regularization; Image analyses;

    机译：涡流检测;裂纹;几何特征;反问题;Tikhonov正则化;图像分析;

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