The principle and application field of infrared camera imaging

In the night vision monitoring system, the conventional method is to use visible light illumination, but this method has the disadvantages of not concealing and is easy to expose the monitoring target, so it is less used.

Here is the content list:

●Imaging principle of the infrared camera

●Application field of the infrared camera

Imaging principle of the infrared camera

The concealed and scientific night vision monitoring is to use infrared camera technology. infrared camera technology is divided into passive and active. Passive infrared imaging technology is to use any material to have infrared radiation above absolute zero (- 273 ℃). The higher the temperature of the object, the more infrared radiation. The most typical camera made by this principle is the infrared thermal imager. However, this special infrared camera is expensive, so it is only used on the military or special occasions. The active infrared camera technology is to use infrared light to radiate "illumination" (mainly infrared light) and uses ordinary low-illuminance black and white camera, color to black and white camera or infrared low-illuminance color camera to feel the infrared light reflected from the surrounding scenery and environment to realize night vision monitoring. Active infrared camera technology is mature and stable and has become the mainstream of night vision monitoring.

An infrared integrated camera is camera equipment that integrates a camera, protective cover, infrared light, power supply,  heat dissipation unit, etc. The basic principle of night vision is to use the ordinary CCD black and white camera to sense the spectral characteristics of infrared light (that is, visible light and infrared light), and cooperate with the infrared lamp as the "lighting source" for night vision imaging. The power and angle of the infrared lamp, the configuration of the camera, the infrared-sensitive lens with a certain focal length, and whether there is a good power supply and heat treatment are important parameters to judge the performance of the infrared integrated camera.

Application field of the infrared camera

The infrared camera on the Chinese market mainly realizes the day-night conversion through the infrared filter, that is, opening the filter in the daytime to prevent the infrared from entering the CCD, so that the CCD can only sense the visible light; In the case of night vision or poor lighting conditions, the filter stops working and no longer blocks the infrared ray from entering the CCD. The infrared ray enters the lens for imaging after being reflected by the object.

However, in practice, infrared cameras often have a clear picture in the daytime, but the picture becomes blurred under infrared light conditions. This is because the wavelengths of visible light and infrared light (IR light) are different, and the different wavelengths will lead to different positions of the focal plane of the imaging, resulting in the phenomenon of virtual focus and blurred image.

The special optical glass material solves the problem that the infrared image of the infrared camera corresponds to the clear image so that the light from the visible light area to the infrared light area can be imaged at the same focal plane position, so as to achieve a clear image.

The firm produces infrared lenses, night vision objective lenses, and other customizable optical lenses. These products cater to various applications such as thermal imaging, infrared sights, night vision devices, infrared cameras, and drone monitors, among others.