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Regularization methods to assess the eddy current density inside conductive non-ferromagnetic media

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

Review of Progress in Quantitative Nondestructive Evaluation Vol. 1581, Nº 1, pp. 1428 - 1432, September, 2014.

ISSN (print): 0094-243X
ISSN (online): 978-0-7354-0888-3

Journal Impact Factor: (in 0)

Digital Object Identifier: 10.1063/1.4864989

Abstract
This presentation describes two regularization methods that were applied to preview the current density induced in an aluminum plate. The images that result from the measurement of one magnetic field component by scanning the plate were used to determine the current density. The scanning was performed using a constant field eddy current probe and a rectangular area including the defect was covered. With the constant field probe a sinusoidal excitation was imposed to the plate, being the amplitude and phase invariant under a limited space translation. The obtained data was inverted and two regularization methods were applied, Tikhonov and total variation. The two methods were compared to conclude about their inclusion into nondestructive test and evaluation instrumentation.