Infrared night vision device infrared night vision imaging technology
Red Visible light at night is very weak, but infrared rays invisible to the human eye are very rich. Infrared vision devices use photoelectric conversion technology to help people observe, search, aim and drive vehicles at night. Although people discovered infrared rays very early, the development of infrared remote sensing technology was slow due to limitations of infrared components. It was not until Germany developed lead sulfide and several infrared transmission materials in 1940 that the birth of infrared remote sensing instruments became possible. After that, Germany first developed several infrared detection instruments such as active infrared night vision devices, but they were not actually used in World War II. There are two types of infrared vision devices: active and passive: the former uses an infrared searchlight to illuminate the target and receives the reflected infrared radiation to form an image; the latter does not emit infrared rays and relies on the target's own infrared radiation to form a "thermal image", so it is also called "thermal image". Imager".
Principle of infrared night vision device
There are more wavelengths of light than just what our eyes can see. In addition, there are many other waves everywhere around us. It's just that we can't detect it with our own senses. Infrared light is the light emitted by objects that exceeds the wavelength of the red color spectrum. Almost all objects will emit infrared light, which is thermal radiation. Even the vast space is no exception. According to surveys, scientists believe that space still contains the heat of the early stages of the universe explosion. Radiation exists. Since everything in the world has thermal radiation. Then we can use this commonality to observe objects according to different object temperatures. Ordinary people's eyes cannot feel infrared, so people cannot see things without reflected light in the dark sky, and any temperature is higher than absolute zero. All objects radiate infrared rays, including your body. Therefore, devices that can sense infrared rays are used to detect infrared rays, and then this analog signal is subjected to background noise removal, amplification, filtering and other image processing methods to restore the outline of the detected object. But colors are difficult to restore, so images seen in infrared are rarely in color.
