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3D EC-GMR sensor system for detection of subsurface defects at steel fastener sites

机译：3D EC-GMR传感器系统，用于检测钢紧固件部位的表面缺陷

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摘要

The problem of detecting deep embedded cracks under fastener heads (CUF) in multilayer structures has resulted in the development of several variations of eddy current based techniques. Eddy current excitation combined with magnetoresistive (MR) sensing has improved the effectiveness in detecting second and third layer defects around fastener heads. An eddy current-giant magnetoresistive (EC-GMR) sensor system has been developed and shown to be feasible in detecting subsurface cracks at fastener sites with aluminum fasteners. The normal component B_z of induced magnetic field is used to identify defective fastener sites by exploiting the asymmetry information in the measured signal. However, the problem of detecting cracks under steel fasteners remains a major challenge since the dominant signals from steel fasteners can mask the contribution from small subsurface defects. This paper presents the feasibility study of detecting cracks under steel fasteners using additional information contained in the tangential components B_y and B_x of induced magnetic field. A model-based study exploiting information in all components using image fusion techniques is presented and feasibility of the approach for automated defect detection is shown.
机译：检测多层结构的紧固件头（CUF）下的深埋裂纹的问题已导致基于涡流技术的多种变型的发展。涡流激励与磁阻（MR）感测相结合，提高了检测紧固件头部周围的第二层和第三层缺陷的有效性。已经开发出涡流巨磁阻（EC-GMR）传感器系统，并且该系统显示出可用于检测铝紧固件在紧固件部位的表面裂纹的可行性。通过利用测量信号中的不对称信息，感应磁场的法向分量B_z用于识别有缺陷的紧固件位置。然而，由于钢紧固件的主要信号可以掩盖较小的表面缺陷，因此检测钢紧固件下的裂纹的问题仍然是一个主要挑战。本文介绍了利用感应磁场的切向分量B_y和B_x中包含的其他信息来检测钢紧固件下的裂纹的可行性研究。提出了基于模型的研究，该研究利用图像融合技术利用所有组件中的信息，并显示了自动缺陷检测方法的可行性。

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  • 来源
    《NDT & E international》 |2012年第2012期|p.20-28|共9页
  • 作者

    G. Yang; Z. Zeng; Y. Deng; X. Liu; L Udpa; A. Tamburrino; S.S. Udpa;

  • 作者单位

    Department of Electrical and Computer Engineering, Michigan State University, East Lansing, Ml 48824, United States;

    Department of Aeronautics, Xiamen University, Xiamen, Fujian 361005, China;

    Department of Electrical Engineering, University of Colorado Denver, Denver, CO 80217-3364, United States;

    Department of Electrical Engineering, University of Colorado Denver, Denver, CO 80217-3364, United States;

    Department of Electrical and Computer Engineering, Michigan State University, East Lansing, Ml 48824, United States;

    Department of Electrical and Computer Engineering, Michigan State University, East Lansing, Ml 48824, United States Department of Electrical and Information Engineering, University of Cassino and Lazio Meridionale, Cassino 03043, Italy;

    Department of Electrical and Computer Engineering, Michigan State University, East Lansing, Ml 48824, United States;

  • 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; giant magnetoresistive sensor; multilayer structure; finite element analysis; nondestructive evaluation;

    机译：涡流巨磁阻传感器多层结构有限元分析;无损评估;

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