入射光源光谱性能对交通标志逆反射光的色度影响研究

Study on Influence of Incident Light Source Spectrum on Retro-reflection Light Chromaticity of Traffic Signs

为了研究不同入射光源光谱性能对交通标志逆反射光的色度性能影响,测试分析了氙灯、白光LED和传统卤素灯等常用机动车前照灯光源的辐照强度发射光谱;测试分析了不同颜色和类型的交通标志逆反射材料的光谱反射率。通过入射光源光谱辐照强度曲线和逆反射材料光谱反射率曲线计算得到在不同类型光源入射条件下逆反射材料的逆反射光色品坐标,并在色品坐标图上分析了相应的位置分布。研究结果表明卤素光源作为入射光源的条件下,不同颜色逆反射材料的逆反射色均向黄色区域发生偏移;氙灯和高色温白光LED作为入射光源的条件下,逆反射材料的逆反射色均向蓝光区域发生偏移;低色温白光LED作为入射光源条件下,逆反射材料的逆反射色向黄光或蓝光区域偏移的情况介于上述两种偏移情况之间;以上影响表明,不同入射光源光谱性能对交通标志逆反射色度性能的影响较大,部分情况下能够使逆反射色品坐标偏离标准区域,导致颜色辨识误差。

In order to research the influence of incident light source spectrum on retro-reflection light chromaticity of traffic sign,the emission spectra of commonly used front light sources for motor vehicles,including traditional halogen light source,xenon light source and white LED light source,are tested and analyzed,and the reflectivity curves of retro-reflective materials with different colors and types that used on traffic signs are also tested and analyzed. The retro-reflection light chromaticity coordinates of retro-reflective materials in different types of incident lights are calculated based on the radiant intensity curves of the emission spectra of light sources and the reflectivity curve of retro-reflective materials,and the positional distribution is also analyzed and shown in chromaticity coordinate diagram. The result shows that（ 1） in halogen light as an incident light source,the retro-reflection chromaticities of retro-reflective materials with different colors shift to the yellow region;（ 2） in xenon light or white LED light with high color temperature,the retro-reflection chromaticities of the retro-reflective materials shift to the blue region;（ 3） in white LED light with low color temperature,the shift result is between the above two. The influence indicates that source spectra of different incident light sources may cause large effect on retro-reflection chromaticity of traffic sign,and the chromaticity coordinates deviate from right region and resulting in color identification errors in some cases.