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：对具有镜反射半透明表面和漫射不透明基底面的平板状半透明介质层，从介质的内部辐射出发，采用伪光源迭加法进行表观光谱发射特性的研究。得到半透明介质层外表面的表观方向光谱发射率及表观半球光谱发射率解析表达式，探讨了表观光谱辐射特性与介质层的光学厚度、介质折射率及基底面的发射率等各影响因素间的相互关系。其中，介质折射率对表观方向辐射特性的影响较大，它和光学厚度等因素一起作用，使表观方向发射呈现出复杂的各向异性
: The flat-shaped translucent dielectric layer with mirror-reflecting translucent surface and diffuse opaque substrate surface was studied by using the pseudo-light source superposition method to study the characteristics of apparent emission from the inside of the medium. The apparent spectral emissivity and the apparent analytical expression of the apparent hemisphere spectral emissivity were obtained on the outer surface of the translucent medium. The relationship between the apparent spectral radiance and the optical thickness of the dielectric layer, the refractive index of the medium and the emissivity of the basal plane Interrelationship between influencing factors. Among them, the refractive index of the medium has a great influence on the radiation characteristic in the apparent direction, which interacts with the optical thickness and other factors to make the apparent emission have a complex anisotropy