Factors affecting the whiteness of optically brightened material.
Factors affecting the whiteness of optically brightened material.
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DOI：
10.1364/josaa.29.002289
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发表时间：
2012-11
期刊：
影响因子：
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通讯作者：
Juan Lin;R. Shamey;David Hinks
中科院分区：
文献类型：
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作者：
Juan Lin;R. Shamey;David Hinks
荧光白色材料的白度部分是由于紫外（UV）光的吸收和随后可见蓝光的发射。因此，观察室和光度计中光源的UV含量可以显著影响感知的白度（PW）和荧光材料的反射光和发射光的测量总和。评价了UV含量对含有不同量的荧光增白剂的荧光白色材料的光谱辐射因子的影响以及随后对其PW的评估。分别模拟D65和D75光源的两个校准观察室中的源的UV含量通过选择性地阻挡源的UV发射改变约0%、25%、50%、75%和100%。还使用反射分光光度计在0%、25%、50%、75%和100%UV透射率下获得了一系列白色织物的辐射光谱。计算白色样品的CIE和内田白度指数（WI），并与不同照明和UV条件下的感知结果进行比较。结果表明，荧光样品和白度指标检查的感知评估之间的相对温和的协议。结果还表明，当观察亭中使用的源的UV含量被调整为与测量中使用的UV含量相似时，获得了感知结果和计算结果之间的改进的相关性。CIE WI被发现在这两种来源下都优于内田指数。
The whiteness of fluorescent white materials is in part due to the absorption of ultraviolet (UV) light and subsequent emission of visible blue light. The UV content of light sources in viewing booths and in spectrophotometers can thus significantly affect the perceived whiteness (PW) and measured sum of reflected and emitted light of fluorescent materials. The effect of UV content on the spectral radiance factor of fluorescent white materials containing different amounts of a fluorescent brightening agent and the subsequent assessment of their PW were evaluated. The UV content of sources in two calibrated viewing booths that simulated D65 and D75 illuminants, separately, was changed by selectively blocking UV emission of the source by approximately 0%, 25%, 50%, 75%, and 100%. The radiance spectra of a series of white fabrics were also obtained using a reflectance spectrophotometer at 0%, 25%, 50%, 75%, and 100% UV transmittance. The CIE and Uchida whiteness indices (WIs) were calculated for white samples and compared to perceptual results under varying illumination and UV conditions. Results indicate relatively modest agreement between perceptual assessments of fluorescent samples and whiteness metrics examined. Results also show that when the UV content of sources used in the viewing booths is adjusted to be similar to that used in measurements, improved correlations between perceptual and calculated results are obtained. The CIE WI was found to outperform the Uchida index under both sources.