物体在整个半球向空间全波长范围内辐射的总能量,与黑体在相同温度下所辐射的总能量之比称为该物体在该温度下的半球向全发射率。它是材料重要的热物性参数。为了精确测量太阳能选择性吸收涂层及其它材料表面的发射率,北京市太阳能研究所研制成一种用计算机处理的半球向全发射率测定装置,并通过了技术鉴定,目前已开始对外服务。 The ratio of the total energy radiated by an object over the full wavelength range to the total energy radiated by a black body at the same temperature is referred to as the hemispherical full emission at that temperature. It is an important thermophysical parameter of the material. In order to accurately measure the solar selective absorption coating and other materials surface emissivity, Beijing Institute of Solar Energy developed a computer processing hemispherical full emissivity measurement device, and passed the technical appraisal, has begun to service.