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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.

Using Excitation Invariance in the Characterization of Defects by Eddy Current Image Constructions, Proc International Conf. on Structural Integrity - ICONS, Kalpakkam, India, Vol. CD , pp. s/n - s/n, February, 2014.

Digital Object Identifier: 0

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.