Measuring the defect size of a rectangular metallic plate with finite size based on sweep-frequency eddy current testing.

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Title: Measuring the defect size of a rectangular metallic plate with finite size based on sweep-frequency eddy current testing.
Authors: Huang, Pu1 (AUTHOR), Han, Zheng1 (AUTHOR), Peng, Lisha1 (AUTHOR) penglisha@mail.tsinghua.edu.cn, Wen, ShuZhi1 (AUTHOR), Li, Shisong1 (AUTHOR), Huang, Songling1 (AUTHOR) huangsling@tsinghua.edu.cn
Source: Nondestructive Testing & Evaluation. Sep2026, Vol. 41 Issue 9, p5307-5326. 20p.
Subjects: Eddy current testing, Newton-Raphson method, Analytical solutions, Nondestructive testing, Least squares, Rectangular plates (Engineering)
Abstract: Eddy current testing can accurately assess the size, shape and location of defects within the material by virtue of its high-precision detection capability, which effectively guarantees the safety and reliability of equipment operation and reduces the risk of accidents. This paper developed a method of eddy current testing (ECT) for estimating the size of the through-hole defect in the rectangle metallic plate with finite size. Specifically, a modified analytical solution method is investigated for rectangle metallic plates with rectangular through-holes. The integration bounds are modified to the values associated with the polar angle and the hole dimensions of the metallic plate. In addition, the size measurement problem regarding the hole is transformed into a least-squares problem, and an improved Newton–Raphson iterative solver is investigated to reconstruct the size of the through-hole defect. Both numerical solutions and experiments are conducted to verify the proposed method. The size of the through-hole defect can be accurately determined by a modified analytical solution and an iterative solver. Related experimental results indicate that the estimation error of defect size is only 3.7%. [ABSTRACT FROM AUTHOR]
Copyright of Nondestructive Testing & Evaluation is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Label: Title
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  Data: Measuring the defect size of a rectangular metallic plate with finite size based on sweep-frequency eddy current testing.
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  Data: <searchLink fieldCode="AR" term="%22Huang%2C+Pu%22">Huang, Pu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Han%2C+Zheng%22">Han, Zheng</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Peng%2C+Lisha%22">Peng, Lisha</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> penglisha@mail.tsinghua.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Wen%2C+ShuZhi%22">Wen, ShuZhi</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Shisong%22">Li, Shisong</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Huang%2C+Songling%22">Huang, Songling</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> huangsling@tsinghua.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Nondestructive+Testing+%26+Evaluation%22">Nondestructive Testing & Evaluation</searchLink>. Sep2026, Vol. 41 Issue 9, p5307-5326. 20p.
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  Data: <searchLink fieldCode="DE" term="%22Eddy+current+testing%22">Eddy current testing</searchLink><br /><searchLink fieldCode="DE" term="%22Newton-Raphson+method%22">Newton-Raphson method</searchLink><br /><searchLink fieldCode="DE" term="%22Analytical+solutions%22">Analytical solutions</searchLink><br /><searchLink fieldCode="DE" term="%22Nondestructive+testing%22">Nondestructive testing</searchLink><br /><searchLink fieldCode="DE" term="%22Least+squares%22">Least squares</searchLink><br /><searchLink fieldCode="DE" term="%22Rectangular+plates+%28Engineering%29%22">Rectangular plates (Engineering)</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Eddy current testing can accurately assess the size, shape and location of defects within the material by virtue of its high-precision detection capability, which effectively guarantees the safety and reliability of equipment operation and reduces the risk of accidents. This paper developed a method of eddy current testing (ECT) for estimating the size of the through-hole defect in the rectangle metallic plate with finite size. Specifically, a modified analytical solution method is investigated for rectangle metallic plates with rectangular through-holes. The integration bounds are modified to the values associated with the polar angle and the hole dimensions of the metallic plate. In addition, the size measurement problem regarding the hole is transformed into a least-squares problem, and an improved Newton–Raphson iterative solver is investigated to reconstruct the size of the through-hole defect. Both numerical solutions and experiments are conducted to verify the proposed method. The size of the through-hole defect can be accurately determined by a modified analytical solution and an iterative solver. Related experimental results indicate that the estimation error of defect size is only 3.7%. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Nondestructive Testing & Evaluation is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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        Value: 10.1080/10589759.2025.2549425
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        Text: English
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        Type: general
      – SubjectFull: Newton-Raphson method
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      – SubjectFull: Analytical solutions
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      – SubjectFull: Nondestructive testing
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      – SubjectFull: Least squares
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      – SubjectFull: Rectangular plates (Engineering)
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      – TitleFull: Measuring the defect size of a rectangular metallic plate with finite size based on sweep-frequency eddy current testing.
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            NameFull: Huang, Pu
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            NameFull: Han, Zheng
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            – D: 01
              M: 09
              Text: Sep2026
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              Y: 2026
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