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Sensitivity analysis of the non-destructive evaluation of micro-cracks using GMR sensors

机译:使用GMR传感器对微裂纹进行无损评估的敏感性分析

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摘要

Micro-cracks in a magnetized ferromagnetic material cause stray fields that can be observed using giant magnetoresistive (GMR) sensors. This work investigates the applicability of GMR sensors to the nondestructive evaluation of micro-cracks via the observation of stray fields. For this purpose, our measurement setup is assessed using a fast new sensitivity analysis based on adjoint states, employing the finite-element method. A model for the GMR sensor is developed and verified. We are able to resolve micro-cracks with an opening of 3 μm and a depth of 30 μm. GMR positioning inaccuracies are analyzed.
机译:磁化铁磁材料中的微裂纹会产生杂散场,可以使用巨型磁阻(GMR)传感器观察到。这项工作通过观察杂散场来研究GMR传感器在微裂纹非破坏性评估中的适用性。为此,我们使用有限元方法,基于伴随状态,使用快速的新灵敏度分析来评估我们的测量设置。开发并验证了GMR传感器的模型。我们能够解决开口为3μm,深度为30μm的微裂纹。分析了GMR定位错误。

著录项

  • 来源
    《NDT & E international》 |2014年第6期|21-29|共9页
  • 作者单位

    Department of Non-Destructive Testing, BAM Federal Institute for Materials Research and Testing, Unter den Eichen 87,12205 Berlin, Germany;

    Department of Non-Destructive Testing, BAM Federal Institute for Materials Research and Testing, Unter den Eichen 87,12205 Berlin, Germany;

    Department of Non-Destructive Testing, BAM Federal Institute for Materials Research and Testing, Unter den Eichen 87,12205 Berlin, Germany;

    Institute of Biomedical Engineering and Informatics, Ilmenau University of Technology, Gustav-Kirchhoff-Str. 2, 98693 Ilmenau, Germany;

  • 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

    Adjoint sensitivity analysis; Inverse problem; Magnetic stray field; Magneto-statics;

    机译:伴随灵敏度分析;反问题;杂散磁场静磁;

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