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Eddy current density by inversion of one measured component of the resulting magnetic field perturbation

Ramos, H. ; Rocha, T. ; Ribeiro, A. L. ; Pasadas, D.

International Journal of Applied Electromagnetics and Mechanics Vol. 52, Nº 1-2, pp. 35 - 40, December, 2016.

ISSN (print): 1383-5416
ISSN (online):

Journal Impact Factor: 0,815 (in 2015)

Digital Object Identifier: 10.3233/JAE-162066

In this paper we present a method to determine the current density inside an aluminum plate using eddy current testing procedure to determine the existence of surface cracks. The general idea consists in generating eddy currents in the plate, which in the case of flawless material, must be of uniform density pointing along a pre-defined direction inside a given area on the plate surface. These currents are produced using a planar coil. The eddy current density is determined by inversion of the data obtained from the measurement of a single component of the resultant magnetic field. Tikhonov regularization is applied to the inverted data.