CIE标准照明光源D65和A光源对铬透辉石绿色的影响  

The Effect of CIE Standard Light Source D and A on the Green of Chromium Diopside

作　　者：张苏绯 ZHANG Sufei(School of Gemmology,China University of Geosciences(Beijing),Beijing 100083)

机构地区：[1]中国地质大学(北京)珠宝学院,北京100083

出　　处：《中国宝玉石》2020年第3期55-61,共7页China Gems & Jades

摘　　要：选择41颗铬透辉石,采用爱色丽X-Rite SP62便携式分光测色仪,以D65和A标准光源为测试光源,CWF标准光源为参比光源,对其进行颜色测量,并基于CIE 1976 L*a*b*均匀色空间,将41颗样品的样品的颜色量化。通过比对不同光源之间颜色参数的差异,确定D65和A光源对铬透辉石颜色的影响。紫外—可见光光谱的可见光范围内,样品的主要吸收带位于600~700nm的红区和400~500nm的蓝紫区,主要透过区为500~600nm的黄绿区,这使得样品呈现绿色,经分析可认为铬透辉石样品的颜色主要由六次配位Cr3+电子能级跃迁导致。X射线荧光光谱表明,绿色越浓的铬透辉石,其Cr3+含量也越多。分析D65和A标准照明光源下铬透辉石的颜色参数,发现蓝绿区能量较高的D65光源更能凸显铬透辉石的绿色;A光源长波红区远高于蓝紫区的能量,视觉效果要比D65下偏黄。双因素方差分析结果表明光源和样品自身两种因素对实际观察到的铬透辉石颜色影响都很显著;单因素方差分析得出光源对铬透辉石的色调角的影响最大,对其余因素影响较小。41 chromium diopside samples were selected, and the colors of samples were quantified by X-Rite SP62 portable spectrophotometer based on CIE 1976 L*a*b* uniform color space with D65 and A standard light source as test light source, while CWF standard light source is used as reference light source. By comparing the color parameters between different light sources, the effects of D65 and A light sources on the color of chromium diopside samples are discussed. The results of Ultraviolet-visible spectrophotometer show that the color of chromium diopside samples is mainly caused by six coordination Cr3+ electron energy level transitions. In the visible light range, the main absorption bands of the samples are located in the red region of 600~700 nm and the blue-purple region of 400~500 nm, and the main permeable region is the yellow-green region of 500~600 nm. That causes the samples to appear green. The results of X-ray fluorescence spectrum show that the green will be deeper with the increase of Cr3+ ion content. The color parameters of chromium diopside samples under D65 and A standard light sources were analyzed. D65 light source, whose energy is higher in the blue-green area, can highlight the green color of Cr3+ diopside. The energy of long wave red area of A light source is much higher than that of blue-purple region, and the visual effect is more yellowish than that of D65. The results of two-way analysis of variance show that both the light source and the sample itself have significant influence on the color of chromite diopside observed in practice, and the one-way analysis of variance shows that the light source has the greatest influence on the hue angle of chromium diopside, but has little effect on other factors.

关 键 词：铬透辉石 颜色成因 标准光源 方差分析 

分 类 号：P575[天文地球—矿物学] O432.3[天文地球—地质学]