Eddy-current imaging of defects in a conductive half-space

Rodrigo de Oliveira Bohbot; Dominique Lesselier; Bernard Duchene; Nathalie Coutanceau

doi:10.1117/12.139018

29 December 1992 Eddy-current imaging of defects in a conductive half-space

Rodrigo de Oliveira Bohbot, Dominique Lesselier, Bernard Duchene, Nathalie Coutanceau

Proceedings Volume 1767, Inverse Problems in Scattering and Imaging; (1992) https://doi.org/10.1117/12.139018
Event: San Diego '92, 1992, San Diego, CA, United States

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.

Citation Download Citation

Rodrigo de Oliveira Bohbot, Dominique Lesselier, Bernard Duchene, and Nathalie Coutanceau "Eddy-current imaging of defects in a conductive half-space", Proc. SPIE 1767, Inverse Problems in Scattering and Imaging, (29 December 1992); https://doi.org/10.1117/12.139018

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