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Interaction of phase-shifted fields of two single-turn coils situated above a conducting medium

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Abstract

An analytical solution is obtained for the problem of the interaction of two phase-shifted electromagnetic fields generated by two coaxial single-turn coils carrying alternating currents of the same frequency, but of different amplitudes and nonzero phase difference, ψ. Two cases are considered: coils situated above a conducting half-space and above a two-layer medium. Numerical results show that ψ is the most important parameter. If the values of ψ and of the other parameters are chosen properly, then the curve representing the change in impedance can lie in any quadrant of the complex plane. These results can be used for developing more sensitive and more selective eddy current testing methods.

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Authors and Affiliations

  1. Department of Automated Control Systems, Riga Technical University, LV 1010, Riga, Latvia

    E. N. Derun

  2. Department of Applied Mathematics, Riga Technical University, LV 1010, Riga, Latvia

    A. A. Kolyshkin

  3. Department of Mathematics and Statistics, University of Ottawa, K1N 6N5, Ottawa, ON, Canada

    Rémi Vaillancourt

Authors
  1. E. N. Derun
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  2. A. A. Kolyshkin
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  3. Rémi Vaillancourt
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Derun, E.N., Kolyshkin, A.A. & Vaillancourt, R. Interaction of phase-shifted fields of two single-turn coils situated above a conducting medium. J Nondestruct Eval 14, 193–200 (1995). https://doi.org/10.1007/BF00730889

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  • DOI: https://doi.org/10.1007/BF00730889

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