The application of external technology in night vision equipment is an important area, which greatly expands the human ability to see at night or in low-light environments. Infrared technology works based on detecting the infrared radiation (thermal radiation) emitted by the target object, since all objects emit infrared radiation based on their temperature. This technology has a wide range of applications in military, surveillance, hunting, search and rescue, and night navigation.
This system does not emit any infrared light, but relies entirely on detecting the infrared radiation emitted by the target object itself. Passive infrared systems usually include infrared detectors and infrared thermography imagers. Infrared detectors can detect infrared radiation emitted by objects and convert it into electrical signals. These electrical signals are then converted into images that are displayed by an infrared imager. This type of night vision equipment works without any external light source, making it ideal for covert surveillance.
Unlike passive infrared systems, active infrared systems emit infrared light and then detect the part of the light that is reflected back by the target object. Such systems usually include infrared emitters and infrared detectors. After the infrared light emitted by the infrared transmitter is reflected by the target object, the infrared detector captures these reflected rays and converts them into an image. Active infrared systems can provide sharper images in completely dark environments, but may be detected by adversaries because it emits infrared light.
Visibility: Infrared night vision equipment provides visual ability in total darkness, which is essential for night operations.
Detection distance: Thermal imagers, in particular, can detect heat sources at distances of hundreds of meters or even more.
Stealth: Passive infrared devices do not emit visible or infrared light, so it is not easy to be found.
Environmental adaptability: Infrared technology is able to penetrate smoke, fog and other visual obstacles to provide clear images.
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