Two-level approach for solving the inverse problem of defects identification in Eddy Current Testing - type NDT

Abstract

Two-level approach for solving the inverse problem of defects identification in Eddy Current Testing - type NDTThis work deals with the inverse problem associated to 3D crack identification inside a conductive material using eddy current measurements. In order to accelerate the time-consuming direct optimization, the reconstruction is provided by the minimization of a last-square functional of the data-model misfit using space mapping (SM) methodology. This technique enables to shift the optimization burden from a time consuming and accurate model to the less precise but faster coarse surrogate model. In this work, the finite element method (FEM) is used as a fine model while the model based on the volume integral method (VIM) serves as a coarse model. The application of the proposed method to the shape reconstruction allows to shorten the evaluation time that is required to provide the proper parameter estimation of surface defects.

Bulletin of the Polish Academy of Sciences: Technical Sciences

“…In non-destructive testing, the inspection of materials is usually carried out with the employment of probes containing coils. The probe in the form of filamentary coil [7][8][9][10], rectangular coil [11,12], aircored coil [13][14][15][16][17][18], I-cored coil [19][20][21][22] and iron core coil [23] were studied. In eddy current testing, pot core probes are very frequently utilized [24,25].…”