Localisation de sources en imagerie par courants de Foucault : application à l’estimation de défauts enfouis dans des structures métalliques
Accepté dans RS série I2M, vol 9, n°3/4,pp 191-212, 2009, Ed. Hermes-Lavoisier
| Résumé |
|
A high resolution approach is proposed to quantitatively estimate the depth of defects
buried in planar metallic structures. This approach associates a multiple signal characterization
(MUSIC) algorithm with an original eddy current imager. The interactions of the eddy
currents and the defects are modelled by a set of virtual magnetic sources propagating in a
spherical manner up to the surface of the structure. The defect localization is carried out using
the MUSIC algorithm, applied to the multi-frequency observation of the magnetic field distribution
at the surface of the structure. Accurate results obtained on simulated and experimental
data relative to defects buried down to 5 mm in an aluminium layered structure validate the
approach.
|
Contacter l'auteur pour la publication complète