Night vision technology is an optoelectronic technology that realizes night observation by means of optoelectronic imaging devices. Night vision technology includes low-light night vision and infrared night vision. Low-light night vision technology, also known as image enhancement technology, is an optoelectronic imaging technology that enhances the weak target image illuminated by night sky light through night vision goggles with an image enhancement tube for observation. Low-light night vision device is currently the night vision device with the largest production volume and equipment and the most widely used abroad. It can be divided into direct observation (such as night vision observation device, weapon sight, night pilot, night vision glasses) and indirect observation. Observation (such as low-light TV) two. Infrared night vision technology is divided into active infrared night vision technology and passive infrared night vision technology. Active infrared night vision technology is a night vision technology that implements observation by actively illuminating and using the infrared light reflected by the target to reflect the infrared source, and the corresponding equipment is an active infrared night vision device. Passive infrared night vision technology is an infrared technology that realizes observation by means of the infrared radiation emitted by the target itself. It finds the target according to the temperature difference or thermal radiation difference between the target and the background or various parts of the target. It is equipped with a thermal imager. Thermal imagers have unique advantages different from other night vision devices, such as the ability to work in fog, rain and snow, long range of action, identification of camouflage and anti-interference, etc. It will replace the low-light night vision device to a certain extent.

 

The nighttime external sight with the image intensifier as the core device does not use the infrared searchlight to illuminate the target, but uses the reflected light from the target under the weak light to be enhanced by the image intensifier on the fluorescent screen as a visible image that can be perceived by the human eye to observe and aim. Target. Infrared night vision device is a military night vision device using photoelectric conversion technology. It is divided into active type and passive type: 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 infrared radiation of the target itself to form a "thermal image", so it is also called "thermal image". instrument".