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Proceedings Paper

Eddy-current imaging of defects in a conductive half-space
Author(s): Rodrigo de Oliveira Bohbot; Dominique Lesselier; Bernard Duchene; Nathalie Coutanceau
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Paper Abstract

Eddy currents generated within damaged, conductive structures are cast in a wave formalism so that coil-recorded fields appear radiated by Huyghens sources within the defect. This leads to wave-imaging techniques, with limitations due to strong decay with depth of the magnitude of the probing field in the structure. Here, we aim at imaging 2-D anomalies in a metal half- space from the anomalous electromagnetic field above, for a time-harmonic source. We discuss (1) a direct Diffraction Tomography algorithm such that attenuation is accounted for via introduction of imaginary frequencies; (2) an iterative simulated annealing method which builds up a two-valve solution (zero or one, whether an elementary cell consists of air or metal) associated with the global minimum of a cost function linked with the discrepancy between existing and retrieved defect.

Paper Details

Date Published: 29 December 1992
PDF: 12 pages
Proc. SPIE 1767, Inverse Problems in Scattering and Imaging, (29 December 1992); doi: 10.1117/12.139018
Show Author Affiliations
Rodrigo de Oliveira Bohbot, Lab. des Signaux et Systemes (France)
Dominique Lesselier, Lab. des Signaux et Systemes (France)
Bernard Duchene, Lab. des Signaux et Systemes (France)
Nathalie Coutanceau, Electricite de France (France)

Published in SPIE Proceedings Vol. 1767:
Inverse Problems in Scattering and Imaging
Michael A. Fiddy, Editor(s)

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