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Volume 2,     Number 3,     Summer 1994

 

ANALYTICAL SOLUTION TO EDDY CURRENT
TESTING OF CYLINDRICAL PROBLEMS WITH
VARYING PROPERTIES
A.A. KOLYSHKIN AND RÉMI VAILLANCOURT

Abstract. An analytical solution to eddy current testing problems in cylindrical coordinates is obtained in the case the excitation coil of the probe is coaxially situated inside a cylindrical tube whose magnetic permeability, μ(r), depends upon the radial coordinate, r. In the particular cases μ(r) = 1/r2 and μ(r) = 1/r, this solution is expressible in terms of Bessel and Whittaker functions, respectively. These results can be used for the evaluation of different properties of cylindrical tubes.

 

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