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A PEC Thrice Subtraction Method for Obtaining Permeability Invariance Feature in Conductivity Measurement of Ferromagnetic Samples

1
School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou 221116, China
2
School of Information and Control Engineering, China University of Mining and Technology, Xuzhou 221116, China
3
School of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
4
Nondestructive Detection and Monitoring Technology for High Speed Transportation Facilities, Key Laboratory of Ministry of Industry and Information, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
*
Authors to whom correspondence should be addressed.
Appl. Sci. 2019, 9(13), 2745; https://doi.org/10.3390/app9132745
Received: 17 May 2019 / Revised: 4 July 2019 / Accepted: 5 July 2019 / Published: 7 July 2019
(This article belongs to the Special Issue Nondestructive Testing (NDT))
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PDF [5195 KB, uploaded 9 July 2019]
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Abstract

Conductivity, as an important index of structural health monitoring, can be used to evaluate heat treatment condition, and sort different materials or measure the stress of mechanical parts. However, the permeability of a measured sample has significant impact on the detected signal in pulsed eddy current (PEC) testing, which is prone to measurement errors due to the effect of permeability change. In this paper, a thrice subtraction method is investigated and utilized to obtain a permeability invariance (PI) feature for reducing permeability effect in conductivity measurement of ferromagnetic samples. The thrice subtraction method is based on the PEC signals of sample and air, the difference signal between the difference PEC signal and its normalization signal, and the difference signal between the difference normalization signal and its standard deviation. In the thrice subtraction signals, the behavior of the obtained PI feature is analyzed by experiments and simulations. The results demonstrate that the thrice subtraction method is a practicable program and the PI feature is potential to measure the conductivity of ferromagnetic samples. The work reported in this paper provides an effective approach to obtain a PI feature for estimating the conductivity of ferromagnetic samples without a permeability effect. View Full-Text
Keywords: pulsed eddy current; ferromagnetic sample; conductivity; permeability pulsed eddy current; ferromagnetic sample; conductivity; permeability
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wen, D.; Fan, M.; Cao, B.; Xue, Z.; Wang, P. A PEC Thrice Subtraction Method for Obtaining Permeability Invariance Feature in Conductivity Measurement of Ferromagnetic Samples. Appl. Sci. 2019, 9, 2745.

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