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Magnetic field-based eddy-current Modeling for multilayered specimens

Lookup NU author(s): Yong Li, Professor Gui Yun TianORCiD

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Abstract

Eddy-current inspection for nondestructive evaluation has traditionally been investigated in terms of coil impedance signals via theoretical and experimental methods. However, advanced eddy-current techniques use solid-state sensors such as Hall devices, giant magnetoresistive sensors, anisotropic magnetoresistive sensors, and superconducting quantum interference devices for magnetic field measurement to achieve better sensitivity and high temporal and spatial resolution in material evaluation and characterization. Here, we review the Dodd and Deeds integral model and use the truncated region eigenfunction expansion (TREE) method for computation of the magnetic field. This results in series expressions instead of integral ones. Thus, the computation is both simplified and speeded up so that it becomes convenient for solving one-dimensional eddy-current inverse problems. We compare the theoretical results from the analytical model with the results from a numerical simulation based on the finite-element method in terms of accuracy and computation time.

Publication metadata

Author(s): Li Y, Theodoulidis T, Tian GY

Publication type: Article

Publication status: Published

Journal: IEEE Transactions on Magnetics

Year: 2007

Volume: 43

Issue: 11

Pages: 4010-4015

Print publication date: 01/11/2007

ISSN (print): 0018-9464

ISSN (electronic): 1941-0069

Publisher: IEEE

URL: http://dx.doi.org/10.1109/TMAG.2007.904930

DOI: 10.1109/TMAG.2007.904930

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