





Volume 1, Number 3, Summer 1993
A PERTURBATION METHOD FOR ASYMMETRIC
PROBLEMS IN EDDY CURRENT TESTING
M. Ya. ANTIMIROV, A.A. KOLYSHKIN AND RÉMI VAILLANCOURT
Abstract. A perturbation method is used to solve eddycurrent
testing problems for a flaw of arbitrary shape situated
in a conducting halfspace when the electric conductivities of
the flaw and the surrounding medium are nearly the same.
A general formula for the change in impedance is obtained.
Examples of cylindrical flaws of finite length and spherical
flaws are given. Detailed numerical results are given in the
case of a flaw in the shape of a circular cylinder of finite length
whose axis is shifted sideways with respect to the axis of the
testing coil.
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