3-D inversion of eddy current data for non-destructive evaluation of steam generator tubes

Abstract : Three-dimensional (3D) eddy current non-destructive evaluation of steam generator tubes is cast in a wavefield integral framework and considered from an inverse problem point of view. Three inversion algorithms based on a gradient-type iterative search are studied: the modified gradient method, an inversion via the source-type integral equation, and one based on the localized nonlinear approximation. To overcome the inherent ill-posed nature of the inversion problem, a binary constraint is enforced on the contrast to be retrieved. Special attention is devoted to the evolution of the iterative processes, which is controlled by means of a tunable 'cooling' parameter. The difficulty of such 3D reconstructions is discussed with emphasis on attenuation problems that are typical in eddy current analysis.
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Contributor : Dominique Lesselier <>
Submitted on : Wednesday, November 2, 2011 - 4:29:10 PM
Last modification on : Thursday, September 27, 2018 - 2:06:02 PM

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Vikass Monebhurrun, Bernard Duchêne, Dominique Lesselier. 3-D inversion of eddy current data for non-destructive evaluation of steam generator tubes. Inverse Problems, IOP Publishing, 1998, 14, pp.707-724. ⟨10.1088/0266-5611/14/3/019⟩. ⟨hal-00637687⟩

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