This sphere serves as a diffuse light source, which enables measurements of the hemisphericalreflectance, 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。
2
The directional emissivity is deduced from the Bidirectional Reflectance Distribution Function (BRDF) in the hemispherical scattering space of the objects.