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Lorentz force eddy current testing: a novel NDE-technique

Hartmut Brauer (Department of Advanced Electromagnetics, Technische Universität Ilmenau, Ilmenau, Germany)
Konstantin Porzig (Department of Advanced Electromagnetics, Technische Universität Ilmenau, Ilmenau, Germany)
Judith Mengelkamp (Department of Biomedical Engineering and Informatics, Technische Universität Ilmenau, Ilmenau, Germany)
Matthias Carlstedt (Department of Advanced Electromagnetics, Technische Universität Ilmenau, Ilmenau, Germany)
Marek Ziolkowski (Department of Advanced Electromagnetics, Technische Universität Ilmenau, Ilmenau, Germany and Department of Applied Informatics, West Pomeranian University of Technology, Szczecin, Poland)
Hannes Toepfer (Department of Advanced Electromagnetics, Technische Universität Ilmenau, Ilmenau, Germany)
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Abstract

Purpose

The purpose of this paper is to present a novel electromagnetic non-destructive evaluation technique, so called Lorentz force eddy current testing (LET). This method can be applied for the detection and reconstruction of defects lying deep inside a non-magnetic conducting material.

Design/methodology/approach

In this paper the technique is described in general as well as its experimental realization. Besides that, numerical simulations are performed and compared to experimental data. Using the output data of measurements and simulations, an inverse calculation is performed in order to reconstruct the geometry of a defect by means of sophisticated optimization algorithms.

Findings

The results show that measurement data and numerical simulations are in a good agreement. The applied inverse calculation methods allow to reconstruct the dimensions of the defect in a suitable accuracy.

Originality/value

LET overcomes the frequency dependent skin-depth of traditional eddy current testing due to the use of permanent magnets and low to moderate magnetic Reynolds numbers (0.1-1). This facilitates the possibility to detect subsurface defects in conductive materials.

Keywords

Acknowledgements

The present work is supported by the Deutsche Forschungsgemeinschaft (DFG) in the framework of the Research Training Group 1567 “Lorentz force velocimetry and Lorentz force eddy current testing” at the Technische Universität Ilmenau.

Citation

Brauer, H., Porzig, K., Mengelkamp, J., Carlstedt, M., Ziolkowski, M. and Toepfer, H. (2014), "Lorentz force eddy current testing: a novel NDE-technique", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 33 No. 6, pp. 1965-1977. https://doi.org/10.1108/COMPEL-11-2013-0383

Publisher

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Emerald Group Publishing Limited

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