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An efficient SQUID NDE defect detection approach by using an adaptive finite-element modeling
, Article Journal of Superconductivity and Novel Magnetism ; Volume 24, Issue 1-2 , 2011 , Pages 1077-1081 ; 15571939 (ISSN) ; Razmkhah, S ; Hosseini, N ; Jurgen Schubert ; Banzet, M ; Fardmanesh, M ; Sharif University of Technology
Abstract
Incorporating the finite-element method for the modeling of the SQUID NDE response to a predefined defect pattern, an adaptive algorithm has been developed for the reconstruction of unknown defects using an optimization algorithm for updating of the forward problem. The defect reconstruction algorithm starts with an initial estimation for the defect pattern. Then the forward problem is solved and the obtained field pattern is compared with the measured signal from the SQUID NDE system. The result is used by an optimization algorithm to update the defect structure to be incorporated in the FEM forward problem for the next iteration. Since the mentioned model based inverse algorithm normally...