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Experimental Measurements of the Eddy Current Signal Due to a Flawed, Conducting Half Space

  • Stuart A. Long
  • Sompongse Toomsawasdi
  • Afroz J. M. Zaman

Abstract

The eddy current method of nondestructive evaluation involves the induction of eddy currents in a conductive test object by a time-varying field produced by a suitable distribution of impressed currents and the detection of the resultant field. The method is ordinarily used at frequencies sufficiently low to neglect effects due to displacement current; hence a theoretical analysis entails calculating the self-impedance of the coil in the presence of the test object. In practice, one often needs only the change in impedance produced by the test object or by changes in the nominal properties of the test object (e.g., changes in its geometry or position with respect to the test coil or coils, or distributed or localized changes in the resistivity of the test object).

Keywords

Test Object Nondestructive Evaluation Eddy Current Complex Impedance Conducting Plane 
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References

  1. 1.
    D.H.S. Chang, “The reflected impedance of a circular coil in the proximity of a semi-infinite medium,” IEEE Trans. Instrumentation and Measurement, Vol, 19, No, 3, pp. 107–116:Sept, 1965.CrossRefGoogle Scholar
  2. 2.
    C.V. Dodd and W.E. Deeds, “Analytical Solutions to eddy-current probe-coil, problems,” J, Appl, Phys., Vol, 39, No. 6, pp. 2829–2838:1968.CrossRefGoogle Scholar
  3. 3.
    Afroz J.M, Zaman, Stuart A. Long, and C. Gerald Gardner, “The impedance of a single-turn coil near a conducting half space,” Journal of Nondestructive Evaluation, Vol. 1, No. 3, pp. 183–189:1980.CrossRefGoogle Scholar
  4. 4.
    Afroz J.M. Zaman, C. Gerald Gardner, and Stuart A, Long, “Change in impedance of a single-turn coil due to a flaw in a conducting half space,” Journal of Nondestructive Evaluation, Vol. 3, No. 1, pp. 37–43:1982.CrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1984

Authors and Affiliations

  • Stuart A. Long
    • 1
  • Sompongse Toomsawasdi
    • 1
  • Afroz J. M. Zaman
    • 1
  1. 1.Department of Electrical EngineeringUniversity of HoustonHoustonUSA

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