RU202110U1 - Screen-type device for protecting speech information from laser interception - Google Patents

Abstract

The utility model relates to the field of information leakage protection. The technical result consists in simplifying the design of a screen-type device for protecting speech information from laser interception through a window. A screen-type device for protecting speech information from laser interception through a window, containing a canvas to cover the window opening, magnetic-type supports, fixed by one end on the window glass and made with a platform at the other end to support the canvas on it, while the canvas is placed in the window opening relying on a magnetic type of support. The device is equipped with metal pads, made with the possibility of magnetic connection with magnetic-type supports and carrying double-sided tape on one side. The canvas is made of polystyrene with a thickness of 3-5 mm and a spectral transmittance in the visible and infrared wavelength range of no more than 1%. Magnetic-type supports are made from the side of the end, attached to the glass, with double-sided tape for connection to the glass, and from the other end - for magnetic connection with the indicated dimes, and the web is pressed against the surface of each metal dime with double-sided tape. 4 ill.

Description

The utility model relates to the field of information protection against leakage through technical channels, in particular, to devices for protecting acoustic speech signals circulating in a room from laser interception from outside through a window.

An optoelectronic (laser) channel of acoustic information leakage is formed when the reflective surfaces of rooms (window panes, frames, mirrors, objects, etc.) vibrate under the influence of an acoustic speech signal with a probe laser beam. The reflected laser radiation is modulated by a speech signal circulating in the room, in amplitude and phase, it is received by a receiver of optical (laser) radiation, during the demodulation of which speech information is extracted. Laser interception is also dangerous because it is difficult to detect, because it uses infrared (i.e. invisible) beams with a wavelength of up to 10 microns.

Glass windows are light, resilient, they have large areas of influence of a sound signal from inside the room. Frames and framing of windows - binders, vents are also subject to vibrations from the speech signal. Vibroacoustic protection systems (SVAZ) are used for protection, containing generators of electric masking noise and vibration emitters and acoustic emitters attached to them. To protect windows, vibration emitters are mechanically connected to glass and frames, and acoustic emitters are placed on the glass surface from the side of the room or between the inner and outer frames. In the protection mode, the generators excite noise mechanical vibrations in the emitters, which are transmitted to the window elements. Mechanical noise vibration of the beam is a hindrance to laser interception from windows. If the frequency range and the level of noise vibration exceed, respectively, the frequency range and the level of vibration generated by speech, then this is called blocking laser interception.

However, optical access through windows is also possible to many elements of the room vibrating from a speech signal - clocks, posters, sheets, dishes, clocks, lampshades, posters, dishes, wall announcements, etc. To do this, the enemy can direct a probe laser beam through the window, focus the beam on these objects and receive a speech-modulated reflected signal. Moreover, the noisy window is not an obstacle to such interception.

A variety of plastic curtains or its combinations with other materials and with various systems for blocking or distorting the signal passing through the glass are widely used.

So, for example, from RU 2682004, H03B29 / 00, H04K3 / 00, publ. 08/20/2018 (this decision was made as a prototype) a device is known for protecting acoustic speech signals circulating in the room from laser interception from the outside through a window, which includes a light-transmitting-diffusing curtain (in the form of a polyester cloth with a thickness of 0.2- 0.3 mm with a relief pattern), on which a ferromagnetic mesh made of thin steel threads is fixed or steel wires are sewn on or strips of magnetic rubber are glued. In the working position, the curtain covers the window glass. Vibration emitters are fixed on the window glass (vibroacoustic protection system) - elements for transmitting glass vibration to the curtain (VD-80 vibration emitters (produced by JSC "Informacustika"). Supports made of solid transparent material in the form of, for example, a cylinder are glued to the glass with one base or prisms, and a permanent magnet is glued to the second base.The curtain itself is wound on a shaft fixed in the upper part of the window frame or on a sienna above the frame.Unwrap the curtain from the shaft and the deployed curtain itself lies on the magnets of the supports and tightly presses against the magnetic elements of the supports, the glass and after the excitation of the vibrating emitters will begin to vibrate together with the glass of the window.In working condition, the curtain is unwound and held in the working position by a weighting agent in the form of a metal plate sewn to the lower edge of the curtain.

The known solution functions as follows. A masking noise signal generator (Kamerton-3 masking noise generator) is switched on, which activates all vibration emitters, they will excite all window elements on which they are installed with masking noise, i.e. glass, frame and curtain. In addition to modulation of the speech information circulating in the room, the light radiation coming out through the window will receive in the curtain an incommensurably large amplitude modulation by masking interference. In addition, the laser beam is repeatedly attenuated by the light-transmitting-diffusing curtain when the beam passes twice through it (into the room and back). There is a blocking of laser interception by an all-encompassing masking interference created by a known device and a light-transmitting-diffusing curtain.

At the end of the closed event, the curtain is disconnected from the magnetic elements and wound on a shaft installed above the window.

A feature of the known solution is that it is used in addition to a pre-installed active system, which, due to the placement of vibrating emitters on window panes, provides an oscillatory process in these panes, which makes it possible to interfere with laser radiation directed to the window and outgoing through the window. Active vibration and acoustic protection systems based on the use of a masking noise generator and vibration emitters are used to prevent information leakage through the enclosing structures (frames and glazing of windows, walls, doors), engineering communications (ventilation, air conditioning, heating, water supply and sewerage pipes) ... Protection is provided by the creation of acoustic and vibroacoustic noise vibrations in the elements of the building structure, engineering communications and the surrounding space. The systems of vibroacoustic and acoustic protection make it possible to prevent eavesdropping of speech information using special technical means, the placement of which is possible on the border or outside the protected premises.

The disadvantage of the known solution lies in the sufficient complexity of its manufacture and use. In particular, the web is made of polyester with a thickness of 0.2-0.3 mm and is intended for winding on a shaft and unwinding from a shaft. In fact, this canvas (curtain) is a film that, although it has. high mechanical strength and ular resistance, resistance to abrasion and repeated deformations during stretching and bending and retains its high impact and strength characteristics in the operating temperature range from -40 ° C to + 60 ° C, but for long-term use outdoors or on window glass this the material needs protection from ultraviolet radiation, which over time destroys the structure of the material. A feature of using a curtain made of this material is that it is unwound from the shaft for the duration of protection, and then rewound onto the shaft. Today it is well known from the practice of application that wide sheets of film, when wound, lie skewed on the shaft, which ultimately leads to a violation of the spatial position of the film in relation to the dimensions of the window glass, the film is warped on the glass, which makes it difficult to correctly position it on the supports.

In addition, such a film, which is equipped with a ferromagnetic mesh made of thin steel filaments, or steel wires are sewn on it or strips of magnetic rubber are glued onto it, is laborious to manufacture and there is a high probability of destruction of such a complex structure (for example, the mesh may peel off or the strips may peel off, etc.). etc.). The possibility of such a multilayer film rolling into a roll on the shaft without its distortions and twisting on this shaft is questioned.

The present utility model is aimed at achieving a technical result consisting in simplifying the design of a screen-type device for protecting speech information from laser interception through a window.

The specified technical result consists in the fact that a screen-type device for protecting speech information from laser interception through a window containing a canvas for covering the window opening, a magnetic type of support fixed by one end on the window glass and made with a platform at the other end to support the canvas on it , while the canvas is placed in the window opening with support on a magnetic type of support, it is equipped with metal dimes made with the possibility of magnetic connection with a magnetic type of support and carrying double-sided tape on one side, the canvas is made of polystyrene with a thickness of 3-5 mm and with a spectral transmittance in the visible and infrared range of wavelengths not more than 1%, magnetic-type supports are made from the side of the end attached to the glass, with double-sided tape for connection with the glass, and from the other end - for magnetic connection with the indicated dimes, and the canvas is pressed against the surface of each metal penny with double sided cattle than.

In this case, as an option, the magnetic-type supports can be made adjustable in height. For example, each magnetic-type support can be made of two parts, one of which can be screwed out of the other, or the magnetic-type support can be made of two parts, one of which can be screwed out of the other, with a washer placed between these parts for support height changes.

These features are essential and are interconnected with the formation of a stable set of essential features, sufficient to obtain the required technical result.

The present utility model is illustrated by a specific example of execution, which, however, is not the only one, but clearly demonstrates the possibility of achieving the required technical result.

FIG. 1 is a schematic diagram of a screen-type device for protecting speech information from laser interception through a window;

fig. 2 is a general view of the magnetic support type;

fig. 3 is a general view of a magnetic support with a metal penny;

fig. 4 - height-adjustable magnetic support with a washer to change its height.

According to the present invention, a screen-type device for protecting speech information from laser interception through a window is considered, which is used as an additional device to preinstalled active systems, which, due to the installation of vibrating emitters on window panes, provide an oscillatory process in these panes, which makes it possible to interfere with laser radiation directed at the window and outgoing through the window. Such active vibration and acoustic protection systems based on the use of a masking noise generator and vibration emitters are widely used to prevent information leakage through enclosing structures (frames and glazing of windows, walls, doors), engineering communications (ventilation, air conditioning, heating pipes, water supply, etc. sewerage). Protection is provided by the creation of acoustic and vibroacoustic noise vibrations in the elements of the building structure, engineering communications and the surrounding space. Vibroacoustic and acoustic protection systems help prevent.

The claimed device is designed to protect acoustic speech information (ARI) circulating in dedicated and protected rooms from leakage due to vibration signals recorded on the enclosing structures of rooms and their interior items by "laser microphones", as well as by viewing from outside the premises using optoelectronic means of articulation of the speaking person. The device can also be used to protect against viewing information displayed on the screens of technical means processing the protected information.

The system of magnetic fastening of the screen cloth to the surface of the window glazing, provided by the design of the device, makes it possible to quickly and very simply install the device on the window during the events within which the ARI is to be protected, and also quickly and easily remove this cloth after the indicated measures. The device operates without power supply.

According to the present utility model, a screen-type device for protecting speech information from laser interception through a window 1 (Fig. 1) contains a canvas 2 for overlapping the window opening, which is made of polystyrene 3-5 mm thick and with a spectral transmittance in the visible and infrared range waves no more than 1%.

Polystyrene is easy to process, resistant to aggressive chemicals, environmentally friendly and odorless, resistant to water, acids and alkalis, and has low resistance to various solvents and industrial oils. It is cheap to obtain and has no analogues in its properties. The canvas 3-5 mm thick has sufficient spatial rigidity to maintain a planar shape without bending and twisting, light enough that it can be easily lifted and inserted into the window opening. This is important, since it is the flatness of such a canvas that allows you to lay all this canvas on the ends of the supports.

In addition to the above, a polystyrene sheet is an excellent resonator of oscillatory processes and vibration and, due to its structure, forms an environment for a favorable and stable propagation of oscillations of a different nature of origin. This is especially important when you consider that when placing a polystyrene sheet on a glass subject to vibration, the meaning of protection is to superimpose the vibrational noise from the sheet on the noise created on the glass.

The spectral transmittance in the visible and infrared range of wavelengths indicates the ratio of radiation transmitted through a polystyrene web to radiation incident on the surface of this web. This coefficient is the result of the structure of the material and the additives introduced into it during manufacture. As shown by infrared spectra, the degree of absorption is approximately proportional to the content of carbonyl groups. The authors experimentally established that for guaranteed absorption of incoming radiation from outside radiation, it is necessary that this coefficient be no more than 1%. Transparent polystyrene canvases are conventionally considered analogs of glass and can be produced with any light transmittance, including one that excludes the possibility of accurate identification of an object located behind the canvas.

Magnetic-type supports 3 are attached to the window glass, fixed with one end 4 on the window glass and made with a platform on the other end 5 for supporting the canvas 2. Magnetic-type supports are made from the side of the end 4 attached to the glass, with double-sided tape for connection with glass. When installing, the protective film is removed from the adhesive tape and the support is pressed against the glass with adhesive tape. And the other end 5 of each support is designed for magnetic connection with a metal penny 6, on one side of which double-sided tape is also fixed.

The canvas 2 is placed in the opening of the window with support on a magnetic type of support 3 (Fig. 2). The screen provides complete overlap of the window glazing. After fixing the magnetic type of supports on the glass, the pennies are attached with the side that does not have adhesive tape to the supports, the protective film or paper is removed from the other side of the nickels from the adhesive tape, and the canvas is pressed to the nickels of these supports and attached with tape on the nickels. Thus, the canvas is pressed against the other end of these supports through the indicated nickels (Fig. 3).

Each magnetic-type support 3 can be made in the form of a post of constant length or height, in which a magnet is placed in the body of the post on the side of its end 5. Alternatively, the support 3 can be made adjustable in height. The fact is that a sheet of polystyrene is superimposed on the window glazing over the vibrating emitters 7 already placed on the glass. These vibrating emitters 7 are made of a certain height in the form of separate modules and are placed on the surface of the window glass taking into account the area of interference coverage by each such module. In order to place the canvas on top of these modules and in the case when the rack is not high enough, it is advisable to use supports with adjustable length / height. FIG. 4 shows an example of a support with adjustable length / height. Such a magnetic type support can be made of two parts 8 and 9, one of which 9 is made with the possibility of unscrewing from the other 8. Just as the development of the considered magnetic type, the support can be made of two parts 8 and 9, one of which is made with the possibility screwing out from the other, while between the specified parts can be placed washer or washers 10 to change the height of the support. After installing the washer, the parts of the support are screwed up until all the support elements are in full contact. The supports themselves can be made of polymer material (to reduce weight on glass) or other material, but in any case, the material of the supports should be structurally related to the category of materials that transmit vibration removed from glass well through their body.

The declared utility model functions by analogy with the operation of a screen-type device according to the prototype and therefore is not described in detail.

The present utility model is industrially applicable and makes it possible to obtain a screen-type device for protecting speech information from laser interception through a window, which is more convenient in design and easier to manufacture and mount / dismantle. The system of magnetic fastening of the curtain to the surface of the window glazing, provided by the design of the device, makes it possible to quickly and very simply install the device on the window during the events within which the ARI is to be protected, and also quickly and easily remove the screen after these events.

Claims (4)

1. A screen-type device for protecting speech information from laser interception through a window containing a canvas to cover the window opening, a magnetic type of support fixed by one end on the window glass and made with a platform at the other end to support the canvas on it, while the canvas is placed in window opening supported on a magnetic type of support, characterized in that it is equipped with metal dimes made with the possibility of magnetic connection with a magnetic type of supports and carrying double-sided tape on one side, the canvas is made of polystyrene with a thickness of 3-5 mm and with a spectral transmittance of visible and infrared wavelengths no more than 1%, magnetic-type supports are made from the side of the end attached to the glass, with double-sided tape for connection with the glass, and from the other end - for magnetic connection with the indicated dimes, and the canvas is pressed against the surface of each metal penny with double-sided tape. 2. The device according to claim 1, characterized in that the magnetic-type supports are adjustable in height. 3. The device according to claim 1, characterized in that each magnetic support is made of two parts, one of which is made with the possibility of unscrewing from the other. 4. The device according to claim. 1, characterized in that the magnetic-type support is made of two parts, one of which is made with the possibility of unscrewing from the other, with a washer placed between said parts to change the height of the support.

Images