Development of a technology for absorbing screening of command posts with electronic equipment

Abstract

The problem of creation of a technology for effective protection of rooms of control points with electronic equipment against powerful intentional and industrial interferences was studied. Development of ray weapons is a new challenge to electronic equipment safety by the use of modern powerful electromagnetic weaponry. Absence of theoretical recommendations in the conditions of growing practical needs causes the relevance of this problem solution.

As a result of theoretical and experimental studies, rational ways for solution of the problem related to the necessity of absorption of the field energy in a wide frequency range at the level of 40...50 dB were substantiated while the level of absorption known from publications is 10...20 dB.

The basis for solving this problem is a significant improvement of the technology for preparation of a filler with necessary electromagnetic properties. This is an electrically conductive ferrite-ferrite compound with a structure of spinel of inverse type which has the commensurate levels of relative dielectric and magnetic permeability and electrical conductivity of (103...104) S/m. These properties of the filler will contribute to the satisfaction of generally contradictory requirements. Such are the requirements for reducing the field energy reflection from the surface of the radiation absorbing coating of the room and the requirements for increasing linear energy absorption by coating (12...15 dB/mm). Therefore, the proposed 4 mm thick absorbing Sorel cement tiles with the proposed filler provide absorption of field energy in a wide frequency band at a level of 40...50 dB due to their polymerization filling.

The choice of the aforementioned binder base for the filler is justified because significant levels of thermal stability of the base are required. In principle, it is also necessary to improve the technology of highly concentrated filling of the solid, heat-resistant polymer base for the radiation absorbing coating, which effectively protects hardware of the command post from contemporary ray weapons.

Existing organic polymer bases for the required coating have a limited ecological purity and working temperature not exceeding 250...300 ^oC.

Therefore, it is expedient to use an environmentally friendly inorganic polymer in a form of Sorel cement with significantly higher thermal stability. That is why the technology of screening rooms by covering their inner surface with absorbing Sorel cement tiles was proposed. Once the filler is prepared, pre-filling of the aqueous solution of cement ingredients with dispersed filler as a field energy converter is made. After solidification of the Sorel cement tiles and covering the surface of the room, energy of interfering electromagnetic fields falling on the coating converts into heat energy.

The necessary hardware screening at a level of 40...50 dB is provided by the following technology stages. First, thermochemical synthesis of conductive ferrite oxide of transition metals with a structure of spinel of inverse type is carried out at a temperature above 600 ^oC. Secondly, vibrational polymerization concentrated filling of the base mixture of the magnesium oxide and saturated aqueous solution of magnesium chloride is realized without the loss of strength of the tiles after their solidification. The tiles are solidified at room temperature for 15 to 17 hours