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材料表面的反射性能随不同的照明角和观察角而变化,还与照射在它上面的辐射波长有关。测量材料表面反射的角和光谱分布的仪器,常叫光谱变角光度计。更确切的名称应为光谱变角反射计。变角反射测量数据,不仅能提供表面反射性质的空间变化,且能积算出绝对反射比值。因此,此法被计量研究机构用来建立反射标
The reflective properties of the material surface vary with different illumination angles and viewing angles, and are also related to the wavelength of the radiation that impinges on it. Instrument to measure the angle and spectral distribution of the surface reflection of the instrument, often called spectral angle photometer. The exact name should be a spectral angle reflectometer. Angular reflectance measurement data, not only provide the spatial variation of the surface reflection properties, and can calculate the absolute reflectance ratio. Therefore, this method is used by metrology institutes to establish reflection standards