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Estimating the Extent of Exfoliation of Dielectric and Magnetodielectric Coatings with Surface Microwaves

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Abstract

We present the results of a study that confirms the high efficiency of using surface microwaves in assessing the extent of exfoliation of dielectric and magnetodielectric coatings from a metal base. The complex coefficient of attenuation of the field of a surface electromagnetic wave along the normal to the coating surface is used as a parameter for estimating the extent of exfoliation. In contrast to the existing approaches, the developed electrodynamic measurement model takes into account the real and imaginary parts of the complex dielectric permittivity and magnetic permeability of the coating with allowance for their frequency dispersion; this improves the accuracy and reliability of estimating the extent of exfoliation. An algorithm is developed for estimating the extent of coating exfoliation based on the search for the maximum joint probability density of the coefficient of attenuation of the field of a surface electromagnetic wave measured at a set of frequencies. We introduce and substantiate a statistical limit of the resolution of two values of exfoliation; this makes it possible to evaluate the possibility of discriminating between two close values of exfoliation depending on the bandwidth of attenuation coefficient measurements, their number, and the signal-to-noise ratio. The structure of a measuring complex that implements the proposed approaches to exfoliation assessment is provided. Numerical and field experiments have shown the fundamental possibility of estimating the value of recorded values of exfoliation of dielectric and magnetodielectric coatings from a metal substrate with a thickness of 20 μm or less in the frequency band of 9–13.5 GHz.

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ACKNOWLEDGMENTS

The work was carried out at the Zhukovsky and Gagarin Voronezh Air Force Academy as part of the preparation of a dissertation for the degree of Doctor of Technical Sciences in doctoral studies at the academy. A.I. Kaz’min would like to thank his scientific adviser in doctoral studies, Doctor of Technical Sciences, Prof. P.A. Fedyunin for help.

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  1. Zhukovsky and Gagarin Voronezh Air Force Academy, 394064, Voronezh, Russia

    A. I. Kaz’min & P. A. Fedyunin

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  1. A. I. Kaz’min
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  2. P. A. Fedyunin
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Correspondence to A. I. Kaz’min or P. A. Fedyunin.

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Translated by V. Potapchouck

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Kaz’min, A.I., Fedyunin, P.A. Estimating the Extent of Exfoliation of Dielectric and Magnetodielectric Coatings with Surface Microwaves. Russ J Nondestruct Test 56, 727–741 (2020). https://doi.org/10.1134/S1061830920090053

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