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测色光谱光度计和光电色度计通常不能直接测量物体的反射比(或其它反射量),而只能进行两个样品的相对比较。这种仪器的校准一般是用已知光谱反射比的标准来完成。国际照明委员会(CIE)推荐了完全反射漫射体(Perfect Reflection Diffuser,简称 PRD)作为反射比的主标准。这种PRD被定义为一个在一定波长范围内反射比都等于1的理想均匀漫射体。但符合上述PRD主标准的实际物质是不可能有的,所以在建立反射比标准时,就
Colorimetric spectrophotometers and photoelectric colorimeters usually can not directly measure the reflectance (or other amount of reflection) of an object, but only a relative comparison of two samples. The calibration of such instruments is generally done using the standard of known spectral reflectance. The International Commission on Illumination (CIE) recommended the Perfect Reflection Diffuser (PRD) as the primary criterion for reflectance. This PRD is defined as an ideal uniform diffuser with a reflectance equal to 1 over a range of wavelengths. But in line with the above PRD main criteria of the actual material is impossible, so in the establishment of reflectance standards, it