非标准光源在颜色测量中的差异性分析

不同光源因光谱功率分布差异，具有不同色温、显色指数，测色差异很大。D65标准光源最接近日光光色，是国际照明委员会(CIE)推荐测色标准光源。但其价格昂贵、工作条件苛刻且不易得，实际测色中常用非标准光源代替。为了研究非标准光源的测色差异，设计了一套溶液比色系统，分别采用高压脉冲氙灯、LED灯、卤钨灯作为光源，亚硝酸盐显色实验为基础，以色度学原理计算3种光源的测色差异。结果显示，氙灯、LED灯光谱分布较为均匀，色度坐标接近等能白光E(0.33, 0.33), 测色比较接近真实颜色，而卤钨灯测色误差较大。氙灯与LED灯在L*a*b*空间测色平均色差ΔE_ab在10 NBS以内，两者与卤钨灯测色平均色差ΔE_ab在20 NBS以上。

Difference analysis of non-standard light source in color measurement

Due to spectral power distribution differences, different light sources have different color temperatures and color rendering indices, and color measurement differences vary widely. D65 standard light source closest to daylight color, is standard light source color measurement recommended by international commission on illumination (CIE). But its price expensive, working conditions harsh and difficult to get, non-standard light source is commonly used in actual color measurement instead. In order to study color measurement difference of non-standard light source, a set of solution colorimetric system was designed. Using high pressure pulsed xenon lamp, LED lamp and halogen lamp as light source, and nitrite color experiment as the basis, color difference of three light source were calculated with chromaticity principle. Results show that xenon lamp, LED lamp spectrum distribution is more uniform, the chromaticity coordinates are close to white E (0.33, 0.33), the measured color is close to real color, and halogen tungsten color measurement error is relatively large. Average color difference ΔE_ab of Xenon lamp and LED lamp in L*a*b* space color measurement is within 10 NBS, while average color difference ΔE_ab of both and halogen tungsten is above 20 NBS.