[ Huaqiang Security Network News ] Do you know about infrared cameras? The following will explain to everyone: 
The infrared night vision camera has the advantages of long night vision distance, strong concealment and stable performance in the surveillance camera. The infrared night vision camera with excellent performance must have the following performance:
(1) Infrared lamp operating conditions Generally speaking, the infrared lamp radiated power is proportional to the forward operating current, but when the maximum rated value of the forward current is approached, the temperature of the device rises due to the heat consumption of the current, so that the light is emitted. The power is reduced. If the infrared diode current is too small, it will affect its radiant power. However, if the operating current is too large, it will affect its life and even burn the infrared diode. When the voltage crosses the positive threshold voltage (about 0.8V), the current begins to flow, and it is a very steep curve, indicating that its operating current requirements are very sensitive. Therefore, the working current is required to be accurate and stable, otherwise the radiation power and its reliability are affected. The increase in radiant power as the ambient temperature (including the increase in ambient temperature due to its own heating) causes its radiant power to decrease. Infrared lamps, especially long-range infrared lamps, heat consumption is a problem that should be paid attention to when designing and selecting. Therefore, the use of infrared lamps must have a good constant current power supply and good heat dissipation design.
(2) Infrared light utilization rate and red storm problem Red storm is a component containing visible light in the emitted infrared rays. Infrared light can be completely red-free (using 940~950nm wavelength infrared tube) or only weak red storm. By reducing the heat consumption of the infrared lamp and adjusting the infrared light angle under the premise of ensuring the power of the infrared lamp, the effective utilization rate of the infrared lamp is maximized. In the selection of infrared lamps, the infrared light with a larger wavelength (910 nm) is selected, and the red storm is strictly reduced, and the red-violet effect can be achieved.
(3) Infrared camera fogging and frosting problems The formation of fog and frost is caused by the condensation of saturated water vapor in the air, which is condensed into frost and fog due to the strong and weak cold environment. In the process of working in the infrared camera, especially the outdoor camera often forms fog or frost on the window glass of the protective cover due to changes in the seasons, temperature difference between day and night, and rain and snow environment, which causes the camera to be unable to see the object and directly affect the monitoring effect.
(4) The window glass cleaning camera of the infrared camera works in rainy and snowy days or in a dusty environment. The window glass of the protective cover is prone to dirt, which causes the camera to block the line of sight. The solution is usually to add a wiper to the shield and to clean the glass by controlling the wiper; another way is to use the invisible wiper window glass.
Compared with ordinary window glass, invisible wiper window glass has the function of repelling water, dust and snow.
(5) The constant temperature problem of the infrared camera is due to the configuration of the infrared lamp with a large amount of heat. After the infrared lamp is started, there will be heat concentration in the front part of the infrared camera during the whole working period (in 12 hours), that is, the front end temperature in the cavity. If it is too high, if it can't dissipate heat evenly, it will affect the normal operation of other components such as cameras.
(6) In addition to the constant temperature problem of the infrared camera, the fully enclosed design of the infrared camera does not leave any heat dissipation holes, which can effectively prevent the entry of dust, moisture and corrosive gases, so that it can adapt to the harsh environment with many dusts.
2. Infrared night vision camera purchase (1) The amount of light passing through the lens of the lens purchase lens or the relative aperture determines the light-passing ability of the lens. The lens light-passing amount relative to the aperture F1.0 is the lens light-passing amount relative to the aperture F2.0. Four times. The same camera, infrared light, the above two kinds of lenses, the infrared distance can be doubled. The large aperture lens is four to ten times better than the conventional ordinary lens. It is reasonable to say that it should be an essential accessory for infrared night vision monitoring. However, due to the high cost and difficult manufacturing technology, most infrared product manufacturers do not have the ability to supply. .
(2) Infrared lamp purchase light is an electromagnetic wave whose wavelength is from a few nanometers (1 nm = 10? 9 m) to about 1 mm (mm). The human eye only sees part of it, which is called visible light. The wavelength range of visible light is 380nm~780nm. The wavelength of visible light is red, orange, yellow, green, cyan, blue and purple, and the wavelength is shorter than purple. For ultraviolet light, a wavelength longer than red light is called infrared light. The selection of infrared light in the night vision system will directly affect the imaging effect of the infrared night vision camera.
(1) Infrared lamp operating conditions Generally speaking, the infrared lamp radiated power is proportional to the forward operating current, but when the maximum rated value of the forward current is approached, the temperature of the device rises due to the heat consumption of the current, so that the light is emitted. The power is reduced. If the infrared diode current is too small, it will affect its radiant power. However, if the operating current is too large, it will affect its life and even burn the infrared diode. When the voltage crosses the positive threshold voltage (about 0.8V), the current begins to flow, and it is a very steep curve, indicating that its operating current requirements are very sensitive. Therefore, the working current is required to be accurate and stable, otherwise the radiation power and its reliability are affected. The increase in radiant power as the ambient temperature (including the increase in ambient temperature due to its own heating) causes its radiant power to decrease. Infrared lamps, especially long-range infrared lamps, heat consumption is a problem that should be paid attention to when designing and selecting. Therefore, the use of infrared lamps must have a good constant current power supply and good heat dissipation design.
(2) Infrared light utilization rate and red storm problem Red storm is a component containing visible light in the emitted infrared rays. Infrared light can be completely red-free (using 940~950nm wavelength infrared tube) or only weak red storm. By reducing the heat consumption of the infrared lamp and adjusting the infrared light angle under the premise of ensuring the power of the infrared lamp, the effective utilization rate of the infrared lamp is maximized. In the selection of infrared lamps, the infrared light with a larger wavelength (910 nm) is selected, and the red storm is strictly reduced, and the red-violet effect can be achieved.
(3) Infrared camera fogging and frosting problems The formation of fog and frost is caused by the condensation of saturated water vapor in the air, which is condensed into frost and fog due to the strong and weak cold environment. In the process of working in the infrared camera, especially the outdoor camera often forms fog or frost on the window glass of the protective cover due to changes in the seasons, temperature difference between day and night, and rain and snow environment, which causes the camera to be unable to see the object and directly affect the monitoring effect.
(4) The window glass cleaning camera of the infrared camera works in rainy and snowy days or in a dusty environment. The window glass of the protective cover is prone to dirt, which causes the camera to block the line of sight. The solution is usually to add a wiper to the shield and to clean the glass by controlling the wiper; another way is to use the invisible wiper window glass.
Compared with ordinary window glass, invisible wiper window glass has the function of repelling water, dust and snow.
(5) The constant temperature problem of the infrared camera is due to the configuration of the infrared lamp with a large amount of heat. After the infrared lamp is started, there will be heat concentration in the front part of the infrared camera during the whole working period (in 12 hours), that is, the front end temperature in the cavity. If it is too high, if it can't dissipate heat evenly, it will affect the normal operation of other components such as cameras.
(6) In addition to the constant temperature problem of the infrared camera, the fully enclosed design of the infrared camera does not leave any heat dissipation holes, which can effectively prevent the entry of dust, moisture and corrosive gases, so that it can adapt to the harsh environment with many dusts.
2. Infrared night vision camera purchase (1) The amount of light passing through the lens of the lens purchase lens or the relative aperture determines the light-passing ability of the lens. The lens light-passing amount relative to the aperture F1.0 is the lens light-passing amount relative to the aperture F2.0. Four times. The same camera, infrared light, the above two kinds of lenses, the infrared distance can be doubled. The large aperture lens is four to ten times better than the conventional ordinary lens. It is reasonable to say that it should be an essential accessory for infrared night vision monitoring. However, due to the high cost and difficult manufacturing technology, most infrared product manufacturers do not have the ability to supply. .
(2) Infrared lamp purchase light is an electromagnetic wave whose wavelength is from a few nanometers (1 nm = 10? 9 m) to about 1 mm (mm). The human eye only sees part of it, which is called visible light. The wavelength range of visible light is 380nm~780nm. The wavelength of visible light is red, orange, yellow, green, cyan, blue and purple, and the wavelength is shorter than purple. For ultraviolet light, a wavelength longer than red light is called infrared light. The selection of infrared light in the night vision system will directly affect the imaging effect of the infrared night vision camera.
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