Introduction of spectral absorptive
spectral absorptive refers to the percentage of radiant energy absorbed by an object at a specific wavelength. Generally, the spectral absorptive of an object is related to the wavelength. All objects in nature have different degrees of absorption, reflection and transmission ability to the radiant energy projected to themselves. The total energy projected from the outside onto the surface of the object. Part of the energy is absorbed by the object after entering the surface, the other part of the energy is reflected by the object, and the remaining energy penetrates the object.