61results about How to "Reduce infrared radiation" patented technology

An controllable intensity LCD display that provides normal or extremely low visible light and infrared intensity levels so as to be usable with military night vision gear (NVG) or Night Vision Imaging Systems (NVIS). The LCD display includes wide dynamic range backlight inverter power supply to extend the range of backlight dimming available with conventional cold cathode florescent (CCF) lights. An optional bridged power inverter provides yet further useable intensity reduction. Video controller RAMDAC palette programming further provides illumination attenuation using the LCD elements themselves. A ‘Hot Mirror’, i.e., infrared reflecting dielectric coatings, on various surfaces of the display's light path is used to further reduce infrared emissions.

A masking arrangement for a gas turbine engine includes a plurality of annular elements arranged overlapping one another when these are viewed in an axial direction so as to mask at least a substantial portion of any interior hot and rotating gas turbine engine part at an aft end of the gas turbine engine from rear view when the masking arrangement is applied downstream the interior part in the gas turbine engine.

The invention discloses a bypass type passive double-throat pneumatic vector spraying pipe with a flow regulating function. A main flow channel in the spraying pipe sequentially comprises a first throat front convergence segment, a first throat, a second throat front expansion and convergence segment and a second throat. According to a body for achieving the flow regulating function of the bypass type passive double-throat pneumatic vector spraying pipe, a flow regulating channel is arranged between a bypass channel bevel and the second throat front expansion and convergence segment. The functions of flow regulation and thrust vector regulation in different work states of the spraying pipe are achieved at the same time through vertically-symmetric flow regulating switches capable of achieving stepless regulation. The spraying pipe is of urgent and great significance on efficient work and thrust vector regulation of an aircraft with the bypass type passive double-throat pneumatic vector spraying pipe in different work states.

An electromagnetic wave absorbing silicon-carbide particle coated by baruim ferrite film is prepared by citrate sol-gel method, that is, proportionally coating the barium ferrite film on the surface of silicon carbide particle. It can be used for wave absorbing coating.

An optical filter made from a borosilicate optical material is provided for flash lamps used in pulsed thermal imaging. The filter substantially eliminates the infrared radiation from flash lamps to allow for accurate detection of surface temperature during entire pulsed thermal imaging tests.

The invention discloses a fin enhanced heat exchange infrared suppressor which is suitable for an exhaust system of a turboshaft engine. The fin enhanced heat exchange infrared suppressor comprises anair collection chamber, a cold air inlet, a firewall, a plurality of shunting spray pipes, mixing pipes, heat insulation covers, fins and the like. On one hand, the momentum of the high-temperature gas behind the turbine is utilized to pump cold air in the air and then mix with the cold air to reduce the mainstream temperature in a core area; and on the other hand, the downwash airflow of a lifting rotor enters interlayers between the mixing pipes and the heat insulation covers, and the outer sides of the heat insulation covers, and the temperature at the surfaces of high-temperature components of the mixing pipes and the heat insulation covers is carried away through a fin enhanced heat exchange, so that the radiation heat transfer of the high-temperature components to the skin is reduced, and meanwhile, the mainstream temperature in the core area is reduced to a certain extent. In addition, a double-layer wall surface structure has good shielding and thermal insulation effects, anda sand-proof residual gas is introduced into a double-layer skin structure, so that the temperature of the machine body is basically consistent with the outside temperature and infrared radiation of the skin to the outside is further reduced.

The invention discloses an S-shaped invisible spray pipe with a cooling structure, and belongs to the field of aero-engines. The S-shaped invisible spray pipe comprises an S-shaped bent spray pipe and an air film cooling and reinforcing device. The air film cooling and reinforcing device is arranged on the outer peripheral surface of the S-shaped bent spray pipe and comprises air film cooling holes, an annular reinforcing device, a cooling air supply device and a reinforcing support column. The annular reinforcing device is an annular cavity with an opening in the inner annular surface and coaxially sleeves the periphery of the S-shaped bent spray pipe, and the opening in the inner annular surface of the annular reinforcing device is attached and fixed to the outer wall surface of the S-shaped bent spray pipe. The air film cooling holes are formed in the wall of the S-shaped bent spray pipe in the annular reinforcing device. The outer annular surface of the annular reinforcing device is connected with an aircraft skin through the reinforcing support column. Cooling air enters the S-shaped bent spray pipe through the cooling air supply device, so that the injected cooling air flow covers the inner wall surface of the spray pipe, and the temperature of the wall surface of the S-shaped bent spray pipe and the infrared radiation of an exhaust system are reduced. Damage caused by the high temperature of the wall surface is prevented, meanwhile, the infrared radiation of the exhaust system can be reduced through the injected cooling airflow, and the hiding performance of the S-shaped bent spray pipe is enhanced.

The invention provides a low infrared signature lobe injection mixing device used for a two-dimensional nozzle outlet. The low infrared signature lobe injection mixing device comprises a rectangular transition section, lobe sections, lobe transition sections and separated cold and hot flow channel sections. A traditional two-dimensional nozzle molded surface cannot effectively shield inner high temperature parts (a center cone, a support plate and a mixer) of an exhaust system, while the special lobe molded surface and baffle plates in separated cold and hot flow channels of the device can effectively shield the high temperature parts, and the detectable infrared radiation of the high temperature parts is reduced; the separated cold and hot flow channel sections separate high temperature combustion-gas flow from injected cold air flow, so that the resistance of cold air flow injection is effectively decreased, and the injection quantity of cold air flow is guaranteed to be quite considerable; and besides, cold flow and hot flow are mixed at the outlet of the device, so that the temperature of the jet flow is greatly decreased, and the infrared radiation of the jet flow can be reduced.

A high efficiency and environment-friendly power truck bed contains a mute box and a generator set arranged in the box, wherein the inside of the mute box is provided with a sound-proof wall which divides the box into a working cavity and an exhaust cavity; the inside of the working cavity is provided with the generator set; the hush exhaust gas flue of the generator set penetrates through the sound-proof wall to be communicated with the exhaust cavity; the inside of the exhaust cavity is provided with a generator set power circulating water cooling wind tunnel which is independent of the working cavity; the water inlet of the cooling wind tunnel is communicated with the water outlet of the generator set; the water outlet of the cooling wind tunnel is communicated with the water inlet of the generator set; and the exhaust cavity is provided with an exhaust outlet and a spraying device. The invention has the following advantages: the noise is lower and is up to less than 50db; the length of the box can be reduced by more than 1/2 while the power and the noise level are not changed, thus facilitating field flexible transfer and stealth; and the discharge temperature of the burnt gas is reduced from more than 450 DEG C to less than 85 DEG C, thus facilitating field infrared stealth. The power truck bed has the comprehensive environmental protection performance of low noise, emission and exhaust gas temperature; and the system has better cost performance.

The invention provides a double-stealth shelter coating with both a radar stealth function and an infrared stealth function. The double-stealth shelter coating comprises an infrared stealth coating and a radar stealth layer. The infrared stealth coating can reduce infrared radiation of the whole coating system, and the radar stealth layer adopts a wave-absorbing material layer and has broadband radar wave shielding performance; and therefore, double stealth functions consisting of the radar stealth function and the infrared stealth function are achieved. The double-stealth shelter coating with the radar stealth function and the infrared stealth function is simple in structure.

The invention relates to the technical field of bullet-proof vests, and specifically discloses an intelligent constant-temperature bullet-proof vest. The intelligent constant-temperature bullet-proofvest comprises a bullet-proof vest body, wherein the bullet-proof vest body comprises a front vest which is attached to the chest of a human body and a back vest which is attached to the back of the human body, a neckline is formed in the connecting position of the tops of the front vest and the back vest of the bullet-proof vest body, both the front vest and the back vest are composed of bullet-proof layers and aerogel insulation layers, the aerogel insulation layers are arranged on the inner side of the bullet-proof vest body and are close to the skin of the human body, and the bullet-prooflayers are arranged on the outer side of the bullet-proof vest body and are far from the skin of the human body. According to the intelligent constant-temperature bullet-proof vest, a graphene conducting film, a body temperature sensor, a minute type cell and a minitype CPU (Central Processing Unit) are designed, so that the graphene conducting film can be effectively and automatically started andstopped according to the body temperature of a soldier, the graphene conducting film is heated so as to supply heat to the soldier, and the problem of decrease of physical performance and executive force due to low body temperature when the soldier performs a task in cold and harsh conditions is avoided.

The invention discloses a photovoltaic module applied to desert areas and tropical areas. The photovoltaic module is formed by overlaying a piece of tempered glass, a first UV cut-off EVA layer, a battery piece, a second UV cut-off EVA layer, an aluminum backboard, a junction box and an aluminum frame in sequence. According to the photovoltaic module, the aluminum backboard is formed by sequentially compounding a first backboard film, a PET layer, an aluminum foil and a second backboard film. The photovoltaic module is reasonable in structure and can be used not only in the desert areas and the tropical areas but also in various areas with severe conditions, the high-performance EVA layers and the aluminum backboard of a novel structure are used, the performance of the photovoltaic module is improved, the power of the photovoltaic module is improved, and the service life of the photovoltaic module is prolonged.

The invention relates to a cold-proof overwintering method for grape vines. The method comprises the following steps: fixing the grape vines onto a fixing device which is away from the ground by the height of 40-50 cm before freezing-up of soil; covering the soil with non-woven fabrics in the planting row direction; and compacting two ends of each non-woven fabric with soil, wherein the non-woven fabrics are filament non-woven fabrics, and the specification of the non-woven fabrics is 500-700 g/m<2>. The method can have windproof, moisturizing, insulating and cold-proof effects effectively, and meanwhile has effects of simplicity in operation, capability of saving time and labor, cost reduction, and reduction of damage to branches, eyes and root systems of the grape vines.

The invention discloses a preparation method of a super-amphiphobic infrared stealth fabric, which is characterized by comprising the following steps: (1) preparing a dopamine aqueous solution, adjusting the pH value to 7.5-9, then immersing the fabric into the dopamine aqueous solution for 8-24 hours, and then cleaning and airing; (2) preparing a functional coating solution: adding hydrotalcite, hollow silicon dioxide, polyurethane, nano metal or nano metal oxide and perfluorinated organosilane into an organic solvent for dispersion; and (3) immersing the fabric cleaned and aired in the step (1) into the functional coating solution prepared in the step (2), and heating at 50-100 DEG C for 5-30 minutes to obtain the required super-amphiphobic infrared stealth fabric. The invention further discloses the super-amphiphobic infrared stealth fabric prepared by adopting the preparation method. Compared with the prior art, the super-amphiphobic infrared stealth fabric has the super-amphiphobic property and the infrared stealth property at the same time.

The invention discloses a three-duct S-shaped spray pipe with a turbulent flow rib-air film cooling structure, and belongs to the field of aero-engines. The three-duct S-shaped spray pipe comprises a convergence section, an expansion section, a third duct, the turbulent flow rib-air film cooling structure and a flow channel adjusting device. The turbulent flow rib-air film cooling structure comprises air film cooling holes and turbulent flow ribs, the multiple air film cooling holes are formed in the inner wall face, close to an annular outlet, of the expansion section and the outer wall face, at an exhaust port of the spray pipe, of the expansion section in the circumferential direction, and a plurality of annular protrusions are arranged on the outer wall face of the spray pipe along the center line and serve as the turbulent flow ribs; and the flow channel adjusting device comprises an adjustable spray pipe wall face and an actuating cylinder, the rotating position of a sheet structure is controlled through stretching and retracting of the actuating end, and then the radial sectional area of the annular outlet of the third duct is changed. The problems of damage caused by large thermal stress, high infrared radiation, deformation and flow control of the three-duct S-shaped spray pipe under different working conditions in the prior art are solved.