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Public:ARHUDFM Features Summary: Difference between revisions

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*The mask protects the face in the area of the eyes, ears, forehead, and back of the head from shards of glass, wood chips, stones, and sandy debris, which can have high kinetic energy and cause superficial and penetrating wounds to the face and head. Together with the lower part of the respiratory protection module, the face is fully protected. We have reinforced the outer layer of the mask with a 2.8 mm thick aramid fiber (kevlar) composite layer. This significantly reduces the kinetic energy of fragments in flight and at the same time increases the weight of the product insignificantly. The front and side parts of the head are additionally protected. The back of the head is quite well protected by a ballistic helmet.
*The mask protects the face in the area of the eyes, ears, forehead, and back of the head from shards of glass, wood chips, stones, and sandy debris, which can have high kinetic energy and cause superficial and penetrating wounds to the face and head. Together with the lower part of the respiratory protection module, the face is fully protected. We have reinforced the outer layer of the mask with a 2.8 mm thick aramid fiber (kevlar) composite layer. This significantly reduces the kinetic energy of fragments in flight and at the same time increases the weight of the product insignificantly. The front and side parts of the head are additionally protected. The back of the head is quite well protected by a ballistic helmet.
*The problem of lens fogging, which for a period of tens of seconds to several minutes completely deprives the user of optical situational awareness, is solved as follows. The mask has two visor lenses with an air insulation barrier between them and an elastic seal around the edges that prevents air exchange and air vapor access. When the mask is used together with the lower part, another seal around the face contour prevents air access to the inner lens surface. Together, an inert system of staggered temperature transitions is formed from the face around the eyes to the inner lens and then to the outer lens, separated by two insulated air chambers. When moving from a cooler to a warmer state, there is no condensation on the lens surface because the lens system retains its thermal inertia longer and does not experience a drastic difference. When in the cold, the exhaled warm air is led away through the insulating skirt to the exhaust valve. When in a fog, condensation from the air condenses on the cooler surfaces, but since the lens system is temperature dependent and much more inert than, for example, the lenses of typical eyeglasses, the outer lens is not cooled down sufficiently for a dew point to form on its outer surface. The physical meaning of the counteraction of condensation is always the same. The dew point at the temperature contrast between the body and the outside air must be in the area of the thermal insulating barrier, which itself has water and vapor barrier that prevents the penetration of air vapor.
*The problem of lens fogging, which for a period of tens of seconds to several minutes completely deprives the user of optical situational awareness, is solved as follows. The mask has two visor lenses with an air insulation barrier between them and an elastic seal around the edges that prevents air exchange and air vapor access. When the mask is used together with the lower part, another seal around the face contour prevents air access to the inner lens surface. Together, an inert system of staggered temperature transitions is formed from the face around the eyes to the inner lens and then to the outer lens, separated by two insulated air chambers. When moving from a cooler to a warmer state, there is no condensation on the lens surface because the lens system retains its thermal inertia longer and does not experience a drastic difference. When in the cold, the exhaled warm air is led away through the insulating skirt to the exhaust valve. When in a fog, condensation from the air condenses on the cooler surfaces, but since the lens system is temperature dependent and much more inert than, for example, the lenses of typical eyeglasses, the outer lens is not cooled down sufficiently for a dew point to form on its outer surface. The physical meaning of the counteraction of condensation is always the same. The dew point at the temperature contrast between the body and the outside air must be in the area of the thermal insulating barrier, which itself has water and vapor barrier that prevents the penetration of air vapor.
*The air space around the eyes is also ventilated by using the lower part of the mask. The air pipes that connect the filters and the obscuring area have technological openings with elastic plugs. During inspiration, the purified air moves to the obscuring area and, by Bernoulli's effect, some air is also aspirated from the sealed area around the eyes, where a slight vacuum occurs. The outlet valve prevents outside air from entering bypassing the filter. The obscuring area inlet valves prevent air from moving back in during exhalation. During the pause between breaths, the pressure in the air chamber around the eye is balanced by the connection to the filter chambers.
*The air space around the eyes is also ventilated by using the lower part of the mask. The air pipes that connect the filters and the obturing area have technological openings with elastic plugs. During inspiration, the purified air moves to the obturing area and, by Bernoulli's effect, some air is also aspirated from the sealed area around the eyes, where a slight vacuum occurs. The outlet valve prevents outside air from entering bypassing the filter. The obturing area inlet valves prevent air from moving back in during exhalation. During the pause between breaths, the pressure in the air chamber around the eye is balanced by the connection to the filter chambers.
*Reduced visibility in the infrared spectrum thermal imaging cameras. The mask protects the open areas of human face skin from thermal light. This reduces the temperature contrast between the surrounding objects and the body parts that the thermal imaging camera records. As you know, the face is the warmest part of the human body.
*Reduced visibility in the infrared spectrum thermal imaging cameras. The mask protects the open areas of human face skin from thermal illumination. This reduces the temperature contrast between the surrounding objects and the body parts that the thermal imaging camera records. As you know, the face is the warmest part of the human body.
*Technological openings are provided in the headphone area so that the person does not lose acoustic awareness when using the mask. In the back of the mask, there are technological openings for ventilation of the electronic components with the airflow direction from top to bottom. This provides additional active ventilation of the user's under-helmet space and, on the other hand, directs warm air to the neck area, which also provides comfort in use, especially during the cooler seasons.
*Technological openings are provided in the headphone area so that the person does not lose acoustic awareness when using the mask. In the back of the mask, there are technological openings for ventilation of the electronic components with the airflow direction from top to bottom. This provides additional active ventilation of the user's under-helmet space and, on the other hand, directs warm air to the neck area, which also provides comfort in use, especially during the cooler seasons.


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