Identification of multiple cracks from eddy-current testing signals with noise sources by image processing and inverse analysis

Yoshiaki Nagaya, Toshiyuki Takagi, Tetsuya Uchimoto, Haoyu Huang

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

This paper proposes a novel method for identifying the number and positions of cracks and reconstructing crack shapes. It assumes that two-dimensional scanned eddy-current testing (ECT) signals obtained from a steam generator tube are a picture image, then a template matching method with the help of genetic algorithms predicts the number and positions of cracks. The present method employs the superposition of crack signals and a nonlinear scaling technique of a signal profile on the crack length that are verified by numerical simulation. The number and positions of the cracks are satisfactorily predicted. The crack-shape reconstructions from the predicted positions with the help of inverse analysis are achieved with a satisfactory degree of accuracy.

Original languageEnglish
Pages (from-to)1112-1115
Number of pages4
JournalIEEE Transactions on Magnetics
Volume40
Issue number2 II
DOIs
Publication statusPublished - 2004 Mar

Keywords

  • Eddy-current testing
  • Inverse problem
  • Multiple cracks
  • Support plates
  • Template matching

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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