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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 eddy-current testing problems for a flaw of arbitrary shape situated in a conducting half-space 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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