<abstract xmlns="http://www.w3.org/1999/xhtml"><p>In eddy current testing, probe-coils with the E-type pot core are commonly used for detecting defects in test objects. In this paper, an analytical mathematical model of such a probe placed above a two-layered conductive material with a surface hole has been presented. The final formulas in the closed form that make it possible to calculate the coil impedance were worked out using the truncated region eigenfunction expansion (TREE) method and implemented in Matlab. Changes in resistance and reactance were determined for both material without a hole and for space containing no conductor. The results were compared with those obtained for the air-cored coil and the I-cored coil. The correctness of the calculations was confirmed through experimental measurements and with the finite element method (FEM) in the COMSOL Multiphysics package</p></abstract>

In eddy current testing, probe-coils with the E-type pot core are commonly used for detecting defects in test objects. In this paper, an analytical mathematical model of such a probe placed above a two-layered conductive material with a surface hole has been presented. The final formulas in the closed form that make it possible to calculate the coil impedance were worked out using the truncated region eigenfunction expansion (TREE) method and implemented in Matlab. Changes in resistance and reactance were determined for both material without a hole and for space containing no conductor. The results were compared with those obtained for the air-cored coil and the I-cored coil. The correctness of the calculations was confirmed through experimental measurements and with the finite element method (FEM) in the COMSOL Multiphysics package

Calculation of the Impedance of an E-cored Coil Placed Above a Conductive Material with a Surface Hole

Institute of Electronics, Faculty of Automatic Control, Electronics and Computer Science

Measurement Science Review

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

In eddy current testing, probe-coils with the E-type pot core are commonly used for detecting defects in test objects. In this paper, an analytical...

Calculation of the Impedance of an E-cored Coil Placed Above a Conductive Material with a Surface Hole

Published Online: May 02, 2019

Page range: 43 - 47

Received: Aug 06, 2018

Accepted: Mar 05, 2019

DOI: https://doi.org/10.2478/msr-2019-0007

Keywords
Nondestructive testing, eddy current, coil impedance, ferrite core, analytical model, truncated region eigenfunction expansion

© 2019 Grzegorz Tytko et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Calculation of the Impedance of an E-cored Coil Placed Above a Conductive Material with a Surface Hole

Published Online: May 02, 2019

Page range: 43 - 47

Received: Aug 06, 2018

Accepted: Mar 05, 2019

DOI: https://doi.org/10.2478/msr-2019-0007

KeywordsNondestructive testing, eddy current, coil impedance, ferrite core, analytical model, truncated region eigenfunction expansion

© 2019 Grzegorz Tytko et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
Nondestructive testing, eddy current, coil impedance, ferrite core, analytical model, truncated region eigenfunction expansion