Advertisement

Calculations of the Flaw Signal Generated by a Differential Eddy-Current Probe

  • S. A. Jenkins
  • J. R. Bowler
Chapter
Part of the Review of Progress in Quantitative Nondestructive Evaluation book series

Abstract

Differential eddy-current probes are attractive because of their insensitivity to lift-off effects. By using two similar coils wound in opposition we have a sensor that detects variations in the magnetic field along a line joining their centers. The impedance plane response of a differential probe to a flaw is rather more complicated than the signal from a single winding probe, but this is a price one must be prepared to pay for nullifying the lift-off signal.

Keywords

Conjugate Gradient Algorithm Differential Voltage Pulse Function Excitation Coil Dipole Density 
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.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    J. R. Bowler, L. D. Sabbagh and H. A. Sabbagh, A Theoretical and Computational Model of Eddy-Current Probes Incorporating Volume Integral and Conjugate Gradient Methods IEEE Trans. Magnetics, Vol. 25, No. 3, pp. 2650–2664 (1989).CrossRefGoogle Scholar
  2. 2.
    L. R. Turner, Ed. Proceedings of the Vancouver Team Workshop, NTIS Report ANL/FPP/TM-230, 1988.Google Scholar
  3. 3.
    J. C. Verite, COMPEL, Vol. 3, No. 3, pp 167–178, 1984.CrossRefGoogle Scholar
  4. 4.
    J. C. Verite, A. Bossavit, J. Cahouet and Y. Crutzen, Eds. Team Workshop and Meeting on the Applications of Eddy-Current Computations, ( Commission of European Communities, Brussels 1989 ).Google Scholar
  5. 5.
    R. F. Harrington, Field Computations By Moment Methods, ( Macmillan, New York, 1968 ).Google Scholar
  6. 6.
    M. Hestenes, Conjugate Direction Methods in Optimization, ( New York: Springer-Verlag, 1980 ).CrossRefMATHGoogle Scholar
  7. 7.
    J. R. Bowler, L. D. Sabbagh and H. A. Sabbagh, To be published.Google Scholar

Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • S. A. Jenkins
    • 1
  • J. R. Bowler
    • 1
  1. 1.University of SurreyGuildford SurreyEngland

Personalised recommendations