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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

Relative Permeability Crack Geometry Magnetic Leakage Flux Surface Current Density Exterior Space 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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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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