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Application of a perturbation method to the solution of eddy current testing problems

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3 Author(s)
Antimirov, M.Ya. ; Dept. of Appl. Math., Riga Tech. Univ., Latvia ; Kolyshkin, A.A. ; Vaillancourt, R.

This paper presents an analytical solution for the change of the impedance of a double conductor line due to eddy currents induced in presence of an infinitely long horizontal cylindrical flaw with vertically symmetric cross-section. The solution, found by a perturbation method, is applicable in the case the conductivities of the flaw and of the surrounding material do not differ by much. Numerical results for flaws of circular and elliptic cross-sections are presented

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Magnetics, IEEE Transactions on  (Volume:30 ,  Issue: 3 )