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Volume 4,     Number 3,     Summer 1996

 

A PERTURBATION METHOD FOR FLAW DETECTION
IN EDDY CURRENT TESTING OF CYLINDRICAL TUBES
M.Ya. ANTIMIROV, A.A. KOLYSHKIN AND RÉMI VAILLANCOURT

Abstract. A perturbation method is used to construct an approximate formula for the change in impedance of a single-turn coil situated coaxially inside a cylindrical tube with a flaw in the tube wall. It is assumed that the electric conductivities of the flaw and the tube are nearly the same. It is found that, in order to obtain the change in the coil impedance due to the flaw, it is sufficient to know only the azimuthal component of the vector potential. Numerical results are given for different positions of the flaw with respect to the coil.

 

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