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Novel Coupled Electric Field Method for Defect Characterization in Eddy Current Non-destructive Testing Systems

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Abstract

This article presents a defect modeling in eddy current non-destructive testing systems by using a new developed method called coupled electric field. It permits to improve qualitatively several models developed so far by many authors using coupled circuit methods that consider the defect only as loss of material. However, a defect can occur with a finite conductivity such as impurity, small burns and micro-solder. For this reason, this investigation consists of extending the coupled circuit method to the modeling of this kind of defects. The proposed approach consists of firstly considering the defect as an electric conductive volume and secondly changing the state variable presenting the electric current by the electric field one. This procedure permits expressing explicitly the impedance variation caused by the presence of an axi-symmetrical defect according to its characteristics. The comparison between the impedance variations calculated using finite elements method and the proposed one demonstrates a very good concordance. After this validation, the study covers also the influence of the defect shape and position on encircling probe impedance. This method is interesting since it permits a fully characterization of this kind of defects and facilitates the inversion process. Moreover, using a 3D finite element observation, this fast tool of simulation can be adapted for a fast phenomenological modeling of asymmetrical configurations.

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Authors and Affiliations

  1. Electrical Engineering Department, El-Hadj Lakhdar University, Batna, Algeria

    T. Bouchala, B. Abdelhadi & A. Benoudjit

  2. Laboratory of Electric Traction Systems—Batna (LSTE—Batna), Batna, Algeria

    T. Bouchala, B. Abdelhadi & A. Benoudjit

  3. Electrical Engineering Department, Kasdi Merbah University, Ouargla, Algeria

    T. Bouchala

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  1. T. Bouchala
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  2. B. Abdelhadi
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Correspondence to T. Bouchala.

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Bouchala, T., Abdelhadi, B. & Benoudjit, A. Novel Coupled Electric Field Method for Defect Characterization in Eddy Current Non-destructive Testing Systems. J Nondestruct Eval 33, 1–11 (2014). https://doi.org/10.1007/s10921-013-0197-5

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  • DOI: https://doi.org/10.1007/s10921-013-0197-5

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