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物体色的测量按照国际照明委员会(CIE)的规定,有1931标准色度系统和1964补充标准色度系统两种。用三刺激值来定量描述。测色仪器应符合上述标准系统。基于光学模拟的校正滤色器就是为了使仪器的光源光谱分布及探测器的光谱灵敏度与 CIE 标准观察者成比例而设计的。设计的原则是使校正滤色器的透射比符合卢瑟条件。优化设计的评价函数一般有三种:总误差面积最小,平方和最小及色差最小。测色仪器按照规定的条件测量物体色时,斜光束会透过校正滤色器而被探测器接收,这时探测器上某点产生的电信号的大小是到达该点的不同角度斜光束的作用综合。对应探测器某点校正滤色器的当量光谱透射比可用修正算式求得。在几何条件为 O/d,光源为卤钨灯,探测器为硅光电池的系统中,用以模拟10°标准色度观察者及标准 D65照明体,不考虑斜光束的影响,按总误差面积最小优化“Y”校正滤色器,匹配面积约为5.1%;而考虑斜光束的影响时,此“Y”滤色器匹配面积误差增为6.8%。理论与实验都证明了斜光束确实有一定影响,在校正滤色器的设计中应加以修正。如果要减少匹配面积误差,提高测色精度,若材料不变,需减薄“Y”滤色器的厚度。
According to the International Commission on Illumination (CIE), there are two kinds of 1931 standard color system and 1964 standard color system. Use tristimulus values to quantify the description. Color measurement equipment should meet the above standard system. Corrected color filters based on optical modeling are designed to make the spectral distribution of the light source of the instrument and the spectral sensitivity of the detector proportional to the CIE standard observer. The principle of the design is to make the transmittance of the correction filter meet the Luther condition. There are generally three kinds of evaluation functions for optimization design: the total error area is the smallest, the sum of squares is the smallest and the color difference is the smallest. When the color measurement instrument measures the color of the object according to the specified conditions, the oblique beam will be received by the detector through the correction color filter. At this time, the size of the electrical signal generated at a point on the detector is different angles reaching the point. The role of synthesis. The equivalent spectral transmittance of the color filter corresponding to a certain point of the detector can be obtained by using the correction formula. In the geometric condition of O / d, the light source is tungsten halogen lamp, the detector is a silicon photovoltaic cell system to simulate the 10 ° standard chromaticity observer and the standard D65 illumination body, irrespective of the influence of the oblique beam, the total error area The minimum optimized “Y ” correction filter has a matching area of about 5.1%; and considering the effect of a skewed beam, this “Y ” color filter has a matching area error increase of 6.8%. Both theory and experiment prove that the oblique beam does have a certain influence and should be corrected in the design of the correction filter. If you want to reduce the matching area error, improve the color measurement accuracy, if the material remains unchanged, the thickness of the “Y” color filter should be thinned.