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The problem of reconstructing the distribution of permittivity and magnetic permeability over the thickness (profile) of non-metallic coatings is relevant in connection with the increasing role of modern methods of radio wave non-destructive testing for assessing the quality of various types of materials and products. Using radio wave methods, the distribution of permittivity and magnetic permeability over layers of multilayer dielectric and magnetodielectric coatings on a metal substrate was reconstructed. The resolution of the method of surface electromagnetic waves in terms of permittivity and magnetic permeability has been studied – the difference between the values of the permittivity and magnetic permeability of adjacent layers of multilayer dielectric and magnetodielectric coatings, respectively. An original method has been developed for assessing the maximum resolution of the surface electromagnetic wave method depending on the electrophysical parameters of the coating layers, the number and bandwidth of measurements, as well as the standard deviation of noise affecting the result of measuring the field attenuation coefficients of the surface wave. The structure of the measuring complex that implements the developed methodology is given. The results of numerical and full-scale experiments to assess the resolution limits of the permittivity and magnetic permeability of layers of two-layer coatings of various types are presented. Numerical experiments were carried out on a sample of a twolayer radio-absorbing coating, and full-scale experiments were carried out on a sample of a two-layer dielectric coating based on Ro4003C and Arlon25N materials. The results of numerical and natural experiments were found to coincide, which confirms the adequacy of the developed methodology. With a measurement bandwidth of 9.0–12.5 GHz and a standard noise deviation of 0.002, the resolution limit for the permittivity and magnetic permeability of layers is 0.25–0.50 %. The proposed technique can be in demand in various science-intensive fields when assessing the electrical parameters of multilayer coatings during efficiency tests.
The problem of reconstructing the distribution of permittivity and magnetic permeability over the thickness (profile) of non-metallic coatings is relevant in connection with the increasing role of modern methods of radio wave non-destructive testing for assessing the quality of various types of materials and products. Using radio wave methods, the distribution of permittivity and magnetic permeability over layers of multilayer dielectric and magnetodielectric coatings on a metal substrate was reconstructed. The resolution of the method of surface electromagnetic waves in terms of permittivity and magnetic permeability has been studied – the difference between the values of the permittivity and magnetic permeability of adjacent layers of multilayer dielectric and magnetodielectric coatings, respectively. An original method has been developed for assessing the maximum resolution of the surface electromagnetic wave method depending on the electrophysical parameters of the coating layers, the number and bandwidth of measurements, as well as the standard deviation of noise affecting the result of measuring the field attenuation coefficients of the surface wave. The structure of the measuring complex that implements the developed methodology is given. The results of numerical and full-scale experiments to assess the resolution limits of the permittivity and magnetic permeability of layers of two-layer coatings of various types are presented. Numerical experiments were carried out on a sample of a twolayer radio-absorbing coating, and full-scale experiments were carried out on a sample of a two-layer dielectric coating based on Ro4003C and Arlon25N materials. The results of numerical and natural experiments were found to coincide, which confirms the adequacy of the developed methodology. With a measurement bandwidth of 9.0–12.5 GHz and a standard noise deviation of 0.002, the resolution limit for the permittivity and magnetic permeability of layers is 0.25–0.50 %. The proposed technique can be in demand in various science-intensive fields when assessing the electrical parameters of multilayer coatings during efficiency tests.
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