Principle of Active Infrared Night Vision Imaging
Simply speaking: the principle of active infrared night vision device is to convert the invisible light (twilight or infrared light) signal from the target into an electrical signal, then amplify the electrical signal, and convert the electrical signal into the human eye. light signal.
Professionally speaking: The principle of the active infrared night vision device is to collect and intensify the existing light by focusing the light on the image intensifier through the eyepiece. Inside the intensifier, a photocathode will be "activated" by light and convert photon energy into Electrons, after being accelerated by an electrostatic region inside the intensifier, hit the phosphor surface screen (like a green TV screen), forming an image visible to the human eye; through the acceleration of the electrons, the enhanced Brightness and image clarity, 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.
