Infrared night vision devices are divided into active and passive, what is the difference between the two
Infrared night vision devices are divided into active and passive, what is the difference between the two?
Active night vision system: it uses near-infrared light as a light source to illuminate the target, such as infrared LED, infrared lamp and near-infrared laser; it uses a low-light camera or a low-light camera to receive the infrared light reflected by the target and 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 the very weak natural light such as moonlight, starlight, night sky light, etc., to amplify and enhance the visual purpose, this kind of night vision device is also called low-light night vision device . The other is to use a far-infrared sensitive detector to detect the thermal radiation of the target itself. This type of night vision device is also called a thermal imager.
