This paper presents an approach to reconstruct a conductive crack from simulated eddy current testing (ECT) signals by means of a stochastic method, such as tabu search. The ECT signals due to conductive cracks have been simulated by a fast forward FEMBEM solver using database. As the width of a conductive crack significantly affects the signal, the database contain information about cracks for various widths. The length, depth, width and conductivity of the crack are unknown in the inversion process. Two crack models are proposed: cracks with parallelepiped shape and cracks with more complex shape; the cracks have uniform conductivity. Numerical results of the 3D reconstruction of conductive cracks from simulated 2D signals are presented and discussed.

Keywords: Eddy current testing, Conductive crack, Numerical simulation, Crack reconstruction, Tabu search