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Analytical Model of Pulsed Eddy Current Signal with Variable Time Resolution

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Abstract

The analytical model of pulsed eddy current (PEC) is of great significance for practical testing. Currently, it is inconvenient to adjust the time resolution of the PEC signal when the IFFT method is used to establish the analytical model. To solve this problem, an alternative algorithm for inverting the frequency-domain model based on the Filon-spline method is proposed to obtain the PEC signal with variable time resolution in this paper. Firstly, the frequency-domain model of PEC for a single-layer plate excited by square wave pulse is derived. Then, according to the attenuation and oscillation characteristics of the frequency-domain model of PEC, the upper limit of the integrand and the number of nodes of the Filon-spline method are determined. After that, the influence of the number of nodes of the Filon-spline method on the modeling accuracy is studied by the numerical simulation. Finally, experiments were carried out to validate the proposed method. It is found that the experimental signal is in good agreement with the simulation signal, and the relative error of the peak values between the two signals is about 1.05%.

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Acknowledgements

This work is supported by Fundamental Research Foundation for the Central Universities under grant 2019XKQYMS35, and Priority Academic Program Development of Jiangsu Higher Education Institutions for funding this study.

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Authors and Affiliations

  1. School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou, People’s Republic of China

    Zhian Xue & Mengbao Fan

  2. School of Information and Control Engineering, China University of Mining and Technology, Xuzhou, People’s Republic of China

    Binghua Cao

  3. School of Information Engineering and Automation, Kunming University of Science and Technology, Kunming, People’s Republic of China

    Bo Ye

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  1. Zhian Xue
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  2. Mengbao Fan
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  4. Bo Ye
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Correspondence to Mengbao Fan.

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Xue, Z., Fan, M., Cao, B. et al. Analytical Model of Pulsed Eddy Current Signal with Variable Time Resolution. J Nondestruct Eval 41, 54 (2022). https://doi.org/10.1007/s10921-022-00885-y

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