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Giant magnetoresistance based eddy current probes for nondestructive testing.

机译：基于巨磁阻的涡流探头，用于无损检测。

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摘要

Detection of deeply buried cracks and of small cracks initiating at edges of metallic parts and structures are among the challenges encountered by the nondestructive testing industry. Solid-state magnetic sensors based on Giant Magneto-Resistance (GMR) and Spin-Dependent Tunneling (SDT) effects have been integrated in eddy current probes that are capable of addressing these difficult problems. Because of their superior sensitivity, small dimensions and low cost, these sensors have been proved effective for detection of deeply buried cracks (up to 25 mm below the surface) using eddy current methods. A problem of great interest in airplane industry that has been successfully addressed in this work is the detection of deep corner cracks around fastener holes in multi-layered aluminum structures. Significant advances in high-resolution metallic profile imaging and corrosion monitoring using the new generation of eddy current probes are reported in this work. Spatial resolution in the range of 100 micrometers has been obtained by using these probes.
机译：无损检测行业面临的挑战之一是检测深埋的裂纹以及在金属零件和结构的边缘产生的小裂纹。基于巨磁阻（GMR）和自旋隧穿（SDT）效应的固态磁传感器已集成在涡流探头中，能够解决这些难题。由于其优越的灵敏度，较小的尺寸和较低的成本，这些传感器已被证明可有效利用涡流方法检测深埋的裂缝（表面以下25mm）。在这项工作中成功解决的一个在飞机工业中引起极大关注的问题是检测多层铝结构中紧固件孔周围的深角裂纹。在这项工作中报告了使用新一代涡流探头在高分辨率金属轮廓成像和腐蚀监测方面的重大进展。使用这些探针可获得100微米范围内的空间分辨率。

著录项

  • 作者

    Dogaru, Teodor.;

  • 作者单位

    The University of North Carolina at Charlotte.;

  • 授予单位 The University of North Carolina at Charlotte.;
  • 学科 Engineering Electronics and Electrical.; Engineering Materials Science.; Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2002
  • 页码 217 p.
  • 总页数 217
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;工程材料学;机械、仪表工业;
  • 关键词

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