In addition to being affected by the number and quality of the image intensifier tube of the night vision device, the observation distance in total darkness is also affected by the distance of the infrared emission lamp. At present, the infrared emission lamp equipped with the night vision device is generally about 30-50 meters away. The second-generation + night vision device can observe about 100 meters in total darkness.
The night external sight with the image intensifier as the core device does not use an infrared searchlight to illuminate the target when working, but uses the light reflected by the target under weak light to enhance the visible image that can be felt by the human eye on the fluorescent screen through the image intensifier to observe and aim at the target. Infrared night vision devices are military night vision devices that use photoelectric conversion technology. It is divided into active and passive types: 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, but relies on the target's own infrared radiation to form a "thermal image", so it is also called a "thermal imager".
Function 1: The visible light at night is very weak, but the infrared rays that are invisible to the human eye are very abundant. Infrared night vision devices can help people observe, search, aim and drive vehicles at night. Although infrared rays were discovered very early, infrared remote sensing technology developed very slowly due to the limitations of infrared components. It was not until 1940 that Germany developed lead sulfide and several infrared transmission materials, which made the birth of infrared remote sensing instruments possible. After that, Germany first developed several infrared detection instruments such as active infrared night vision goggles. In an encounter with a British tank column, a German Panther tank equipped with an infrared sighting device destroyed two British Firefly tanks in one fell swoop. It is worth mentioning that the German army used active infrared night vision devices in this battle, so there was also an Owl infrared searchlight vehicle in the distance to illuminate the Panther tank with infrared rays during the battle.
Basic Principles To understand the principles of night vision goggles, you must understand the principles of light. The energy of a light wave is related to its wavelength: the shorter the wavelength, the higher the energy. Among visible light, purple light has the highest energy, while red light has the lowest energy.
