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。
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。
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。
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