Introduction of infrared lens and infrared camera

Infrared lens: In the spectrum, the wavelength from 0.76 to 400 microns is called infrared, which is invisible light. All substances above the fine zero temperature (-273.15°C) can produce infrared rays. Modern physics calls it heat rays. Medical infrared can be divided into two categories: near infrared and far infrared Brief description of infrared lens: Infrared cameras have low power supply and use two types of infrared: near infrared or short-wave infrared, with a wavelength of 0.76 to 1.5 microns, which penetrates deeply into human tissues, about 5 to 10 mm; far infrared or long-wave infrared, with a wavelength of 1.5 to 400 Micron, mostly absorbed by the surface skin, penetration depth is less than 2 mm. Enhance the ability to capture night images. So most users need infrared cameras to pursue strong camera effects. The real infrared night vision device is a photomultiplier tube imaging, which is completely different from the principle of a telescope. It cannot be used during the day, is expensive and requires a power supply to work. Infrared lens technology application: Infrared cameras on the Chinese market mainly use infrared filters to switch between day and night, that is, open the filter during the day to block infrared rays from entering the CCD, so that the CCD can only sense visible light; night vision or poor lighting conditions , The filter stops working and no longer blocks infrared rays from entering the CCD. After being reflected by the object, the infrared rays enter the lens for imaging. However, in practice, infrared cameras often have clear images during the day, but the images become blurry under infrared light conditions. This is because the wavelengths of visible light and infrared light (IR light) are different, and the difference in wavelength will cause the focal position of the image to be different, resulting in virtual focus and blurred images. The IR lens uses the latest optical design methods, special optical glass materials, and advanced technologies such as special films and materials to eliminate the focal plane shift of visible light and infrared light. The special optical glass material solves the problem of clear imaging of the infrared camera, so that the light from the visible light area to the infrared light area can be imaged at the same focal plane position to achieve a clear image; the special film technology allows the infrared light to be exhausted. Possible to pass through; Multi-layer coating can also suppress the occurrence of ghosts and flashes under backlight conditions to the greatest extent, and can obtain relatively high-contrast superior images even under adverse conditions such as backlighting. Infrared lens application range The IR lens has a very wide range of applications, which can be used for special purposes corresponding to infrared or as an ordinary lens. In other words, depending on the use occasion, the infrared corresponding lens can be used flexibly with the conventional infrared camera. The infrared camera does not have an infrared cut filter, but the spectrum of daylight also contains infrared light, so even in daylight conditions, the imaging of the infrared camera will be interfered by infrared rays. Therefore, the corresponding infrared lens can effectively improve the image quality. How to choose infrared lens Infrared cameras need to determine the camera type according to the specific use environment, especially the night environment, as follows: 1) Investigate the light source environment of the infrared camera installation point at night: if there is light or no light, whether the light is dim or no light environment, this determines how low the light source of the camera will automatically turn on the auxiliary camera to monitor, and achieve good results. Image effect 2) Determine the approximate range that the infrared camera needs to see in the environment: if you want to see 30 meters, 50 meters, 80 meters, or 100 meters, at this distance * far, you need to see the activities of the objects or the faces of the people. The projection range can also be understood the same as ordinary light projection, but when using an infrared camera, the general infrared and camera lens have been determined, and the infrared light and camera lens have already been made into a set of finished effects, so it’s not like a normal camera. That way, you can easily change the lens to change the angle of view. It should be noted that the larger the night vision irradiation area, the higher the cost and the greater the energy consumption. Therefore, users can install auxiliary infrared light sources in some important areas according to specific actual needs, so as to obtain better width for some important areas. The scope of the monitoring effect.