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Chin. Phys. B, 2018, Vol. 27(6): 060308    DOI: 10.1088/1674-1056/27/6/060308
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General series expression of eddy-current impedance for coil placed above multi-layer plate conductor

Yin-Zhao Lei(雷银照)
School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, China
Abstract  

This paper presents a closed expression of the layered-plate factor used to calculate the coil eddy-current impedance over the multi-layer plate conductor. By using this expression, the general series of eddy-current impedance can be written directly without solving the undetermined constant equations. The series expression is easy to use for theoretical analysis and programming. Experimental results show that calculated values and measured values are in agreement. As an application, when the bottom layer of the layered plate is a non-ferromagnetic thin layer conductor and the product of the thickness and conductivity of the layer remains unchanged, using the layered-plate factor expression proposed in this paper, it can be theoretically predicted that the eddy-current impedance curves corresponding to different thin layer thickness values will coincide.

Keywords:  multi-layer plate conductor      layered-plate factor      series expression      eddy-current impedance  
Received:  04 February 2018      Revised:  16 April 2018      Accepted manuscript online: 
PACS:  03.50.De (Classical electromagnetism, Maxwell equations)  
  41.20.-q (Applied classical electromagnetism)  
  81.70.Ex (Nondestructive testing: electromagnetic testing, eddy-current testing)  
Fund: 

Project supported by the National Natural Science Foundation of China (Grant No.51577004).

Corresponding Authors:  Yin-Zhao Lei     E-mail:  leiyinzhao@buaa.edu.cn

Cite this article: 

Yin-Zhao Lei(雷银照) General series expression of eddy-current impedance for coil placed above multi-layer plate conductor 2018 Chin. Phys. B 27 060308

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