Thermal Imaging Technology During the day, the human eye can see the scenery in nature. Because the eye receives direct light that reflects the sun on the surface of the scene, or scatters light. At night, although there is no solar illumination, in most nights, there are still moonlight, starlight or atmospheric glow. The surface of the scene in nature still reflects these faint light, so the human eye can still see the nearby scenery and the big The outline of the scene is observed at night, and the basic contradiction is that the light intensity received by the human eye is insufficient.