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Model-Based Prediction of Pulsed Eddy Current Testing Signals from Stratified Conductive Structures  

Zhang, Jian-Hai (School of Mechanical Engineering, Sungkyunkwan University)
Song, Sung-Jin (School of Mechanical Engineering, Sungkyunkwan University)
Kim, Woong-Ji (School of Mechanical Engineering, Sungkyunkwan University)
Kim, Hak-Joon (School of Mechanical Engineering, Sungkyunkwan University)
Chung, Jong-Duk (Korea Railroad Research Institute)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.31, no.6, 2011 , pp. 609-615 More about this Journal
Abstract
Excitation and propagation of electromagnetic field of a cylindrical coil above an arbitrary number of conductive plates for pulsed eddy current testing(PECT) are very complex problems due to their complicated physical properties. In this paper, analytical modeling of PECT is established by Fourier series based on truncated region eigenfunction expansion(TREE) method for a single air-cored coil above stratified conductive structures(SCS) to investigate their integrity. From the presented expression of PECT, the coil impedance due to SCS is calculated based on analytical approach using the generalized reflection coefficient in series form. Then the multilayered structures manufactured by non-ferromagnetic (STS301L) and ferromagnetic materials (SS400) are investigated by the developed PECT model. Good prediction of analytical model of PECT not only contributes to the development of an efficient solver but also can be applied to optimize the conditions of experimental setup in PECT.
Keywords
Pulsed Eddy Current Testing; Stratified Conductive Structures; Analytical Modeling; Interlayer Corrosion;
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