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Coil impedance due to a sphere of arbitrary radial conductivity and permeability profiles

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2 Author(s)
Theodoulidis, Theodoros P. ; Dept. of Eng., Aristotle Univ. of Thessaloniki, Kozani, Greece ; Kriezis, E.E.

This paper presents analytical expressions for coil impedance due to a spherical workpiece consisting of concentric spherical shells. The expressions are used to simulate the nondestructive inspection of a sphere having arbitrary radial conductivity and magnetic permeability profiles by a circular coil of rectangular cross section. The simulation replaces continuous profiles with piecewise constant profiles. The paper compares the results to published experimental measurements and the results of other analytical solutions

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Magnetics, IEEE Transactions on  (Volume:38 ,  Issue: 3 )