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。
2
This sphere serves as a diffuse light source, which enables measurements of the hemisphericalreflectance, or the directional absorptance, respectively.