Infrared radiation and reflection in an inhomogeneous coating layer on a substrate.
By taking into account all kinds of radiation source for the inhomogeneous coating layer on a substrate, that is, transmitted radiation from the radiative substrate, self-radiation of the coating layer and reflection of the coating layer to incident radiation, the radiative transfer equations are built and derived. The definitions of apparent emittance and reflectance for such an inhomogeneous coating system are given. The influence of various factors, such as layer thickness, the optical constants of components in the layer, and emittance of the substrate, on radiation and reflection properties of the coating is discussed in detail.
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