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Using Excitation Invariance in the Characterization of Defects by Eddy Current Image Constructions

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

Procedia Engineering Vol. 86, Nº 2014, pp. 440 - 451, November, 2014.

ISSN (print): 1877-7058
ISSN (online):

Journal Impact Factor: (in )

Digital Object Identifier: 10.1016/j.proeng.2014.11.057

Abstract
In this article the eddy current method is used to characterize defects in conductive non-ferromagnetic plates. A special attention is paid to the presentation of results in the form of images. An inverse problem with Tikhonov regularization is solved to obtain the two-dimensional distribution of currents inside the material under test. With this purpose a uniform field probe is used to guarantee a spatially invariant excitation field for probe scanning translations. The probe contains a magnetic field detector based on high sensitivity giant magneto-resistors which reads the magnetic field component parallel to the excitation and induction currents.