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Study on the Impedance Change of Rectangular Coil Perpendicular to Conductive Cylinder

  • ELECTROMAGNETIC METHODS
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Russian Journal of Nondestructive Testing Aims and scope Submit manuscript

Abstract

Cover meter is widely used to monitor the reinforced structures, and the response of the cover meter probe coil is used to locate the rebar, evaluate the diameter and cover depth of the rebar embedded in concrete. In order to analyze and optimize the performance of the cover meter, the analytical solution to the response of the probe is of great importance. Based on the theory of the second order vector potential (SOVP), the integral solutions to the coil coefficient and the impedance change of the rectangular coil are achieved when the normal direction of the coil is perpendicular to the axis of the conductive cylinder. The theoretical and experimental results are in excellent agreement induced not only by nonmagnetic materials but also by magnetic materials. The impedance changes of the rectangular coil and the circular coil with same sectional area are compared theoretically, as a consequence, the rectangular coil can help to find the direction of the rebar embedded in concrete. The allowed frequency of the coil is also discussed. These integral solutions to the impedance change of the rectangular coil can help the cover meter designers to optimize the coil parameters and the exciting frequency conveniently.

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ACKNOWLEDGMENTS

I would like to express my sincerest gratitude to my supervisor, professor Yinzhao Lei, who gave me many significant instructions, and to leaders from school of information engineering, Zhengzhou university, giving me the opportunity and a long term time to do my research work. Special thanks should go to Xingle Chen for our useful discussions.

Funding

This study was funded by the National Natural Science Foundation of China (grant no. 51577004, 2016).

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Authors and Affiliations

  1. School of Automation Science and Electrical Engineering, Beihang University, Haidian District, 100191, Beijing, China

    Ligang Liu

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  1. Ligang Liu
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Correspondence to Ligang Liu.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Ligang Liu Study on the Impedance Change of Rectangular Coil Perpendicular to Conductive Cylinder. Russ J Nondestruct Test 56, 581–591 (2020). https://doi.org/10.1134/S1061830920070062

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