The significance of infrared and night vision equipment and thermal imaging

It should be that night vision equipment can see people better and thermal imaging equipment can find people more easily.

We can look at the principle of night vision: how can people turn invisible light into visible light and improve low illumination? This has to start with a characteristic of light. /kloc-Smith, an Irishman in the 0 th and 9 th centuries, discovered a photoelectric effect, which made it possible to convert light and electricity into each other. In today's highly developed science and technology, it is not difficult to convert, disguise and amplify electrical signals. As long as the brightness of different parts of the scene is converted into electrical signals (current and voltage) with different sizes, and then the light image is converted into an electrical image by scanning technology, this process is called photographing. Finally, the electric image is reduced to light image by imaging technology to achieve the purpose of observation. Take the infrared night vision device as an example, illuminate the target with an infrared lamp, because infrared light is invisible light, so you can not expose yourself, and then convert the invisible electric image into an optical image visible to the naked eye through an infrared image converter, so as to achieve the purpose of observation. Thermal imaging uses the thermal contrast between the target and the surrounding environment due to the difference in temperature or emissivity to image. Because of the different thermal contrast, the infrared radiation energy density distribution map is displayed as a thermal image, and then the infrared image is changed into a visible light image through the thermal image.

The thermal imager directly displays infrared images, which are expressed in different colors, so as long as there is temperature, there is a display of color and human body temperature.