Title :
Coil impedance due to a sphere of arbitrary radial conductivity and permeability profiles
Author :
Theodoulidis, Theodoros P. ; Kriezis, Epameinondas E.
Author_Institution :
Dept. of Eng., Aristotle Univ. of Thessaloniki, Kozani, Greece
fDate :
5/1/2002 12:00:00 AM
Abstract :
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
Keywords :
Helmholtz equations; coils; conducting bodies; current distribution; eddy current testing; eddy currents; electric impedance; magnetic permeability; arbitrary magnetic permeability profiles; arbitrary radial conductivity; coil impedance; concentric spherical shells; continuous profiles; current distribution; eddy current; electromagnetic field quantities; filamentary excitation; nondestructive inspection; piecewise constant profiles; spherical workpiece; vector Helmholtz equation; Coils; Conductivity; Eddy currents; Electric variables; Engine cylinders; Geometry; Impedance; Inspection; Magnetic analysis; Permeability;
Journal_Title :
Magnetics, IEEE Transactions on
