The Active Infrared Night Vision Imaging Principle
Simply said, the idea behind an active infrared night vision device is to turn a target's invisible light (twilight or infrared light) signal into an electrical signal, amp it up, and then translate it into the human eye. a signal light.
Professionally speaking, the active infrared night vision system's basic operation is to gather and enhance the available light by directing it toward the image intensifier through the eyepiece. A photocathode inside the intensifier will be "activated" by light and transform photon energy into electrons. These electrons will then be accelerated by an electrostatic region inside the intensifier and hit a phosphor surface screen (similar to a green TV screen), creating an image visible to the human eye. The enhanced brightness and image clarity are achieved through the acceleration of the electrons, as shown in the figure below.
Low-light night vision devices, in order to see objects at night, are visible to the naked eye through incremental processing of weak light. In order to achieve better results, the current low-light night vision devices are basically equipped with infrared emitters. It can be used as an auxiliary light when the light is too dark. But because it is easy to be discovered, which is what domestic enthusiasts often call "red exposure", it is basically used in the civilian market now.
