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An Analytical Solution for the Eddy Current Coil Located over a Conductive Disc with Two Layers of Different Radii Cover

An Analytical Solution for the Eddy Current Coil Located over a Conductive Disc with Two Layers of Different Radii

Measurement Science Review
Volume 26 (2026): Issue 4 (August 2026)
By: ,   and    
Open Access
|Jun 2026
Figures & tables

Figures & Tables

Fig. 1.

Cross-section of a coil located over a disc with two layers of different diameters.

Fig. 2.

Normalised changes in the resistance ΔR.

Fig. 3.

Normalised changes in the resistance ΔX.

Parameters of the two-layer discs_

SetLayerMaterialDiameter [mm]Thickness [mm]Conductivity [MS/m]
1UpperBronze59.622.076.09
LowerBrass39.925.1214.22
2UpperBronze59.622.076.09
LowerGraphite30.155.020.52

Changes in the coil impedance ΔZ=Z−Z0 for frequency f=1 kHz and f=10 kHz_

SetFreq. f [kHz]Experiment ΔZ [Ω]Calculations ΔZ [Ω]Error ΔR [%]Error ΔX [%]
1123.18 − j 27.4323.07 − j 27.060.41.4
10256.1 − j 667.1259.0 − j 658.41.21.3
2122.05 − j 7.9721.95 − j 7.930.50.4
10310.0 − j 701.5312.3 − j 693.30.71.2
DOI: https://doi.org/10.2478/msr-2026-0021 | Journal eISSN: 1335-8871
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Language: English
Page range: 168 - 171
Submitted on: Feb 1, 2026
Accepted on: Apr 28, 2026
Published on: Jun 10, 2026
Published by: Slovak Academy of Sciences, Institute of Measurement Science
In partnership with: Paradigm Publishing Services
Publication frequency: Volume open
Keywords:
non-destructive testing,
eddy currents,
coil impedance,
analytical modelling
Related subjects:
Engineering,
Electrical engineering,
Control engineering, metrology and testing

© 2026 Grzegorz Tytko, Yike Xiang, Yao Luo, published by Slovak Academy of Sciences, Institute of Measurement Science
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Volume 26 (2026): Issue 4 (August 2026)
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