Infrared ray is an electromagnetic wave having a wave length at range from 0.76μm to 1000μm longer than the visible ray. The theory of radiation energy propagation can be considered from electromagnetic wave theory and quantum mechanics. To achieve high efficiency heat effects of infrared radiant are made to accommodate radiation characteristic of radiant and absorption characteristic of matter heated. Consequently, infrared radiation and its utilization are described for kind of infrared radiant, measurement of infrared radiation spectrum, evaluation and utilization of infrared radiants.
