Above absolute zero, the infrared thermal radiation emitted by the human body is more than other static objects. Passive infrared is based on this feature to see moving objects in a non-line environment. Currently, passive infrared monitoring is mainly used for thermal imaging in Dongguan. Thermal imaging cameras are based on special thermal radiation sensors and optics. It can form effective images in complete darkness or even obstacles. For example, in many adverse weather conditions, ordinary cameras cannot monitor suspicious objects, and thermal imaging cameras can determine abnormal conditions based on thermal radiation. However, because it cannot form a clear image, it can only be used as a supplement to professional monitoring systems.
Active infrared cameras use artificial infrared light to actively emit infrared light to the environment, allowing the sensor to sense infrared characteristics and achieve night vision. The infrared light that the camera says is equipped with, according to craft and technology can be divided into LED infrared, LED array infrared, laser infrared.
LED infrared light emits infrared light from light emitting diodes. Due to its low cost and low technical threshold, most infrared cameras in the market today use such infrared lamps. In form, there is a row of tiny lights around the camera lens. However, its limitation is that the infrared light has a low electro-optical conversion rate, a short irradiation distance, a large amount of heat, a short life span, and a non-uniform monitor brightness. Cameras using this kind of infrared light are mostly used in indoor channels, warehouses, outdoor walls, gates, trunk roads, etc., and are suitable for monitoring scenes where the area is small and the distance is relatively short.
Array LED infrared technology based on the original LED infrared, more infrared crystal original packaged in a lamp. Make infrared light more powerful, longer night vision, more uniform light. Infrared cameras around this lens are bulky. Some array-type infrared lamps also have follow-up technology, and the infrared lamps can be adjusted according to the change of focal length of the camera lens. It is more suitable for applications with large areas and long distances. However, due to the fact that a plurality of crystals are packaged together, a large amount of heat and a short life span are its shortcomings. However, with the development of technology, this piece has also been rapidly improved in the past two years. At present, many high-end infrared cameras use this technology.
The laser infrared lamp is formed by a semiconductor laser and a lens. The laser beam has a large angle and energy concentration and is ideal for long-distance lighting. With the zoom lens, the laser and the camera can be actuated, allowing the light to change according to the focal length of the camera. However, the current cost of laser infrared lamps is still relatively high, and the corresponding price is very high. Most of them are used on PTZ cameras for long-distance monitoring, such as scenic spots and railways. However, recently laser infrared has also appeared some short-distance products, the cost is slightly higher than the infrared light. Therefore, with the advancement of technology, it is expected that laser infrared will be popular in the next few years.
Flame Retardant Science and Technology is to meet social security needs of production and life, to prevent fires and protect lives and property and developed a science. Flame retardant technology is the application in real life, it is a flammable material used to improve the combustion properties of flammable special chemical additives, are widely used in various types of flame-retardant decoration materials processing. Processed through the flame retardant material, fire in an attack by the outside world, can effectively prevent, delay or terminate the spread of fire to achieve the flame retardant effect. According to different criteria for the classification can be flame retardant into the following categories: according to fire-retardant elements contained in sub- Element can be contained by fire retardant into halogen flame retardant, phosphorus flame retardants, flame retardant nitrogen and phosphorus - halogen flame retardant, phosphorus - nitrogen flame retardants and other categories.
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