There are generally two types of
night vision laser systems: active and passive. The active night vision system uses near-infrared light as the light source to illuminate the target, such as infrared LEDs, infrared lamps, etc., and uses a low-illumination camera or a low-light camera to receive the infrared light reflected by the target. Convert the video signal to display the image on the monitor screen synchronously. Such night vision devices are called active infrared night vision devices. However, this kind of camera has a short lifespan, high consumption, and only has an effect within a hundred meters. Therefore, this type of camera has been gradually eliminated in the monitoring field.
There are two types of passive night vision systems. One is to use all very weak natural light such as moonlight, starlight, sky glow, night sky light, etc., to amplify and enhance it to achieve visual purposes. This kind of night vision device is also called low light. night vision goggles. The other is to use far-infrared sensitive detectors to detect the thermal radiation of the target itself. This kind of night vision device is also called thermal imager. Under the condition of passive imaging measurement under natural light illumination, but due to the influence of various background radiation, the imaging system's ability to image measurement and accurate tracking of long-distance targets is limited.
