Fictitious electric conductivity modelling of eddy current evaluation of magnetic materials

Bouchala, Tarik; Aouf, Anouaressadate; Abdelhadi, B.; Benoudjit, A.

doi:10.1080/10589759.2019.1628958

Cited by 3 publications

(1 citation statement)

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“…One of the most frequently used methods of interpreting the results obtained in eddy current testing uses theoretical analysis to predict the changes of the probe impedance components [1][2][3][4][5]. The probe may be an alternating current fed coil, the impedance of which changes because of the probe fields interaction defects in the tested material.…”

Section: Introductionmentioning

confidence: 99%

Locating Defects in Conductive Materials Using the Eddy Current Model of the Filamentary Coil

Tytko

2021

J Nondestruct Eval

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This article presents an innovative technique for detecting flaws in conductive materials by using an ideal filamentary coil. To characterize such a coil accurately and explicitly, it is sufficient to be in possession of merely two parameters: the radius of the circle within which all the turns are located and the distance of the coil from the tested surface. The mathematical model derived using the truncated region eigenfunction expansion method enables the calculation of the changes in the components of the filamentary coil impedance that are the result of positioning the coil close to the conductive material with a hole. Because of this, the air-cored coil model can be replaced with a much simpler filamentary coil model. This solution makes it is possible to detect various types of holes (internal, surface, subsurface or through) occurring in both multilayer magnetic and non-magnetic materials. The derived results were verified by means of measurements and numerical calculations based on the finite element method. Very good agreement was observed in both cases. The paper contains the source code implemented in Matlab, which is used to for calculations.

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