Principles of designing electromagnetic screens of the resonant type based on liquid protective compositions
DOI:
https://doi.org/10.32347/2411-4049.2023.1.59-67Keywords:
electromagnetic safety, shielding, resonant absorption, electrophysical propertiesAbstract
The work explores the possibilities of creating resonance-type electromagnetic shields to protect workers and the population from man-made electromagnetic fields. It is shown that traditional resonant screens are not technological enough to cover large surfaces and are tuned to monochrome or narrow-band electromagnetic fields. Based on the analysis of the experience of using liquid shielding mixtures, the possibility of creating a multilayer structure without fixed layer thicknesses, which will allow protection against the influence of the frequency band, has been proven. At the same time, the wave resistance of the outer layer allows you to minimize the reflection coefficients of electromagnetic waves, which makes the material practically absorbent. A calculator for the preliminary calculation of the electrophysical properties of each layer is presented, which allows rationalizing the required coefficients. For calculations, the formulas of Odelevsky and Debye for the dielectric constant of mixtures are adapted. Experimentally obtained empirical coefficients are presented, which are a component of the ratio for obtaining acceptable screen parameters. To determine the exact concentration of the shielding filler in the matrix, a correction factor is provided. This is associated with errors when determining the volume content of the filler of low dispersion and differences in the morphology of the filler particles, which does not allow for an accurate calculation of the depolarization coefficient of the filler particles. Given the lack of reference data on the electrophysical parameters of the compositions due to their diversity, it is advisable to conduct thorough laboratory studies with different compositions of the compositions. This will make it possible to form a reference database that will speed up the execution of electromagnetic safety work and reduce their cost.
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