What technology is infrared night vision lens applied to

Infrared night vision lenses are mainly used in a dark environment with no visible light or low light, using an infrared emitting device to actively project infrared light onto an object, and the infrared light enters the lens for imaging after being reflected by the object. At this time, what we see is the picture formed by the reflection of infrared light, not the picture formed by the reflection of visible light. At this time, it is possible to take pictures that are invisible to the naked eye in a dark environment. Light is an electromagnetic wave, and its wavelength range is from a few nanometers (1nm=10-9m) to about 1 millimeter (mm). What is visible to the human eye is only part of it. We call it visible light. The wavelength of visible light ranges from 380nm to 780nm. The wavelength of visible light is divided into red, orange, yellow, green, blue, blue, and violet from long to short. The wavelength is shorter than that of violet light. It is called ultraviolet light, and the wavelength longer than red light is called infrared light. Usually people divide infrared light into three parts: near, middle and far infrared. Near-infrared refers to a wavelength of 0.75 to 3.0 microns; mid-infrared refers to a wavelength of 3.0 to 20 microns; far-infrared refers to a wavelength of 20 to 1000 microns. Since infrared light is invisible light, it cannot be seen in space by the naked eye. Therefore, a form of infrared light that can emit infrared light is actively emitted by LED diode infrared light, which is widely used in night vision monitoring that requires concealment. Traditional low concealment lighting night vision monitoring. Infrared lamps have different powers and two wavelengths of 715 and 850nm. The difference in wavelength determines the distance and effect of the infrared lamp.