Surface crack reconstruction from eddy current images using a direct semi-analytic model

Eric Vourc'H (1) , Thierry Bore (1) , Caifang Cai (2) , Romain Soulat (3)

1 SATIE - Systèmes et Applications des Technologies de l'Information et de l'Energie
2 L2S - Laboratoire des signaux et systèmes
3 LSV - Laboratoire Spécification et Vérification [Cachan]

A method relying on a direct semi-analytic model is proposed for reconstructing cracks from eddy current images. We consider systems featuring a uniform excitation flow which can be modelled by means of fictitious current sources distributed in the crack volume. Thanks to the relative simplicity of the model a reconstruction method based the comparison of EC images is considered. The sensitivity of different images comparison criteria is studied for 2D surface cracks, leading to a reconstruction method based on a genetic algorithm. Numerical experiments are carried out to examine the performances of the algorithm in terms of convergence and accuracy.

Keywords: genetic algorithm; eddy current; crack retrieval; nondestructive testing; imaging

Domains: Engineering Sciences [physics]; Signal and Image processing; Engineering Sciences [physics]; Electromagnetism; Physics [physics]; Mathematical Physics [math-ph]

Eric Vourc'H, Thierry Bore, Caifang Cai, Romain Soulat. Surface crack reconstruction from eddy current images using a direct semi-analytic model. Journal of Physics: Conference Series, 2015, 657, 012015 (6pp). ⟨10.1088/1742-6596/657/1/012015⟩. ⟨hal-01263386⟩