This sphere serves as a diffuse light source, which enables measurements of the hemispherical reflectance, or the directional absorptance, respectively.
这个球作为扩散光源，使测量的半球形或定向吸收率的反射系数，分别使用。
The directional emissivity is deduced from the Bidirectional Reflectance Distribution Function (BRDF) in the hemispherical scattering space of the objects.
利用双向反射分布函数测量系统，通过对物体表面双向反射分布的测量来获得其方向发射率。
The directional emissivity is deduced from the Bidirectional Reflectance Distribution Function (BRDF) in the hemispherical scattering space of the objects.
利用双向反射分布函数测量系统，通过对物体表面双向反射分布的测量来获得其方向发射率。
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