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In the night vision monitoring system, the conventional method is to use visible light illumination, but this method has the disadvantages of being incapable of concealing and easily exposing the monitoring target, so that the use of less, concealed, scientific night vision monitoring is infrared imaging technology. Infrared camera technology is divided into passive and active. Passive infrared camera technology uses any substance to have infrared radiation above absolute zero (-273 ° C). The higher the temperature of the object, the more infrared radiation is emitted. The most common type of camera made with this principle is the thermal imaging camera. However, this special infrared smart camera is expensive and therefore limited to military or special occasions. The active infrared camera technology uses infrared light to radiate "illumination" (mainly infrared light), and applies ordinary low-light black-and-white camera, color-to-black-and-white camera or infrared low-light color camera to feel the infrared light reflected from surrounding scenes and environment. Night vision monitoring. The active infrared camera technology is mature and stable, and has become the mainstream of night vision surveillance. 
Analyze the imaging principle of infrared intelligent camera
Infrared smart cameras have become more and more popular in recent years due to the characteristics of infrared smart cameras. Today Xiaobian for you to analyze the infrared smart camera imaging principle.
The infrared integrated smart camera is a camera device that integrates a camera, a protective cover, an infrared lamp, and a power supply cooling unit. The basic principle of night vision is that ordinary CCD black and white cameras can be used to sense the spectral characteristics of infrared light (that is, it can sense visible light and infrared light), and use infrared light as an "illumination source" for night vision imaging. The power and angle of the infrared lamp, the configuration of the camera, the infrared lens with a certain focal length, and whether there is a good power supply and heat dissipation process are important parameters for judging the performance of the infrared integrated smart camera.
In the market, there are also many products in which the infrared projector is separated from the camera. This requires you to have a good understanding of the performance of the infrared light and the camera in order to make a reasonable match according to the angle of the infrared light and the camera lens parameters.