ECT Inversion Using a Knowledge-Based Forward Solver |
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Authors: | Zhenmao Chen Kenzo Miya |
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Affiliation: | (1) Nuclear Engineering Research Laboratory, University of Tokyo, 2-22 Shirakata-shirane, 319-1106 Tokai, Ibaraki, Japan;(2) Present address: Structure Safety Engineering Section, Oarai Engineering Center, PNC, 4002 Narida, Oarai, 311-1393 Ibaraki, Japan |
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Abstract: | In this paper, a new approach was proposed for crack reconstruction based on ECT technique and optimization theory. A newly
developed fast forward solver was applied for predicting the impedance signals during the inversion procedure. Comparing with
the conventional approaches, the scanning signal due to an arbitrary shaped crack can be calculated in a significantly reduced
CPU time but with higher accuracy. The conjugate gradient algorithm was employed in the optimization of the crack parameters,
with the gradient calculated numerically from the electric field in the crack region. The scheme was implemented for the shape
reconstruction of EDM cracks from the measured impedance data having in mind possible applications in the inspection of steam
generator tubing. Several cracks embedded in conducting tube or plate were reconstructed from the observed impedance data
by concerning the benchmark models proposed by T. Takagiet al. Good reconstruction results were obtained within a short CPU time. Consequently, the validity of the new approach was verified. |
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Keywords: | ECT inverse problem database fast scheme shape reconstruction |
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