Creating and sharing knowledge for telecommunications

A simple forward direct problem solver for eddy current non-destructive inspection of aluminum plates using uniform field probes

Ribeiro, A. L. ; Ramos, H. ; Postolache, O.

Measurement: Journal of the International Measurement Confederation Vol. 2012, Nº 45, pp. 213 - 217, January, 2012.

ISSN (print): 0263-2241
ISSN (online): 0263-2241

Journal Impact Factor: 0,662 (in 2008)

Digital Object Identifier: 10.1016/j.measurement.2011.03.029

Download Full text PDF ( 1 MB)

Abstract
In this paper we show that a simple algorithm used to model the eddy current inspection of an aluminum plate can be used to preview the acquired voltage signals. Thus, the algorithm is suitable to work as a forward problem solver to determine the expected measurement signal obtained with a uniform excitation field probe including a giant magnetoresistor sensor. The algorithm is based on a conformal transformation and is able to preview the shape of the electrical current lines when a metallic plate with a superficial straight crack is subject to a sinusoidal excitation field with constant amplitude and orientation in a bounded zone around the sensor element. Simple and fast algorithms as the one presented in this paper are of paramount importance for testing inversion algorithms used to characterize defects in metallic plates.