A Model for the Interpretation of A.C. Magnetic Stray Flux Measurements

  • G. Dobmann
  • G. Walle
Conference paper

Summary

The reconstruction of crack geometry, especially the sizing of crack height, from measured magnetic leakage-flux data in the vicinity of surface cracks is a general aim of NDT in the last decade. The contribution gives an overview about a numerical interpretation model developed and investigated in the IzfP for harmonic time-varying magnetic fields. The numerical analysis is based on a Fredholm-integral-equation system for the field vectors. Numerical results are compared with experimental leakage-flux amplitude-locus curves of well-known surface slits. For the inverse problem calibration steps for crack-height-, -inclination-and -width-estimation are given.

Keywords

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Copyright information

© Springer-Verlag Berlin Heidelberg 1983

Authors and Affiliations

  • G. Dobmann
    • 1
  • G. Walle
    • 1
  1. 1.Fraunhofer-Institut für zerstörungsfreie PrüfverfahrenSaarbrückenGermany

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