红外辐射是一种肉眼看不见的光。人们很早称它为热辐射。到十九世纪七十年代末,才出现红外辐射这个名词,用来代替热辐射。事实上,不只是热的物体有红外辐射,任何物体不论在白天或黑夜都有红外辐射。即使是冰,也发射红外光。只是不同物体,不同温度,所发射的红外光的波长有所不同。就我们周围环境而言,各种物体的红外辐射的波长大致在2微米至100微米的范围内。而红外技术在某些情况下就是利用这 Infrared radiation is a kind of invisible light. People have long called it thermal radiation. By the late seventies of the nineteenth century, the term infrared radiation was used instead of thermal radiation. In fact, not only hot objects have infrared radiation, any object has infrared radiation, either day or night. Even ice, it emits infrared light. Only different objects, different temperatures, infrared light emitted by the wavelength of different. In our surroundings, the wavelengths of the infrared radiation of various objects are in the approximate range of 2 to 100 microns. Infrared technology, in some cases, is to use this