Active night vision system: It uses near-infrared light as a light source to illuminate the target, such as infrared LEDs, infrared lamps and near-infrared lasers, etc.; use a low-illumination camera or a low-light camera to receive the infrared light reflected by the target, convert it into a video signal on the monitor screen This kind of night vision device is called active infrared night vision device.

 

Passive night vision system: There are two types, one is to use all very weak natural light such as moonlight, starlight, night sky light, etc., to enlarge and enhance it to achieve the purpose of visibility. This kind of night vision device is also called low-light night vision device. . The other is to use far-infrared sensitive detectors to detect the thermal radiation of the target itself. This type of night vision device is also called a thermal imager.