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Inverse Transformation in Eddy Current Tomography with Continuous Optimization of Reference Defect Parameters.

Paweł Nowak1, Roman Szewczyk2, Anna Ostaszewska-Liżewska1

  • 1Institute of Metrology and Biomedical Engineering, Warsaw University of Technology, 02-495 Warsaw, Poland.

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This study introduces an inverse tomography method for eddy current testing, accurately identifying defect dimensions in steel samples through continuous optimization. The technique demonstrates reliable repeatability and precise defect characterization.

Keywords:
eddy current tomographyfinite element methodinverse tomography transformation

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Area of Science:

  • Non-destructive testing
  • Electromagnetism
  • Computational modeling

Background:

  • Eddy current testing is a key non-destructive evaluation method.
  • Tomography offers advanced imaging capabilities for material characterization.
  • Accurate defect parameterization is crucial for material integrity assessment.

Purpose of the Study:

  • To develop and validate an inverse tomography transformation methodology for eddy current testing.
  • To precisely determine defect dimensions in ferromagnetic steel samples.
  • To assess the repeatability and accuracy of the proposed inverse tomography method.

Main Methods:

  • Utilized eddy current tomography (ECT) setup for measurements.
  • Developed a Finite Element Method (FEM)-based forward tomography transformation.
  • Implemented continuous optimization of reference defect parameters for inverse transformation.

Main Results:

  • Achieved high accordance between inverse tomography results and real defect parameters.
  • Demonstrated acceptable repeatability for the developed method.
  • Obtained sample parameter values within the range of expanded uncertainty compared to actual parameters.

Conclusions:

  • The presented inverse tomography methodology accurately identifies defect dimensions in ferromagnetic steel.
  • Continuous optimization of reference parameters enhances the precision of eddy current tomography.
  • The method shows potential for reliable and repeatable non-destructive evaluation of material defects.