Eddy-current evaluation of 3-D defects in a metal plate: a first analysis of a contrast-source gradient method
Résumé
Retrieval of voluminous defects in a non-magnetic metal plate from maps of time-harmonic anomalous magnetic fields in air due to a source nearby is performed by a contrast-source, gradient-type technique which uses the binary aspect of the sought conductivity distributions. The functional analysis within a Green-based vector integral formulation of the diffusive fields is sketched and the efficiency of the approach is discussed from synthetic data in demanding defect configurations.