汽车前照灯光谱分布差异对回复反射器光度色度的影响

Influence of Spectral Distribution of Motor Vehicle Headlamps on Photometry and Chromaticity of Retro-Reflecting Devices

为了研究汽车前照灯光谱分布差异对回复反射器光度色度的影响,运用光谱仪测量了H1、H7、D2S和LED汽车前照灯的光谱分布,测量了白色、琥珀色和红色三种回复反射器的光谱反射率曲线,通过计算得到同一种反射器在不同光源照射下的发光强度系数和色坐标。研究表明:白色反射器的发光强度系数受照射光源光谱分布差异的影响小于1.5%,可以忽略;而琥珀色和红色反射器受照射光源光谱差异的影响较大。D2S照射琥珀色和红色反射器,发光强度系数为标准光源A照射下的97.51%和68.22%;LED照射琥珀色和红色反射器,发光强度系数仅为标准光源A照射下的85.02%和54.62%;同时在D2S和LED照射下,琥珀色反射器偏绿而红色反射器偏黄,色坐标均不满足GB 4785—2008的要求。该研究对LED汽车前照灯、回复反射器的设计和检测具有重要意义。

The study was aimed to explore and analyze the influences of motor vehicle headlamps light sources upon the retro-reflecting devices. The experiments included gauging spectra distributions of H1,H7,D2 S and LED motor vehicle headlamps with a spectrometer,and the spectral reflectance curves of white,amber and red color retro-reflecting devices were also measured. Both the results contributed to the calculation of coefficient of luminous intensity and chromaticity coordinates of retro-reflecting devices under different light sources. The research indicated that,by contrast with white retro-reflecting devices,the amber and red devices are more likely to be affected by the change of light source spectra. Also,the coefficient of luminous intensity of amber and red retro-reflecting devices under the illumination of D2 S or LED are both weaker than under the standard light source A. Meanwhile,with D2 S or LED,the amber retro-reflecting device was green cast,and the red retroreflecting device was yellow cast. Thus,neither of the above chromaticity coordinates was able to meet the requirements of GB 4785—2008. This study is expected to be significant to the design and the test of LED motor vehicle headlamps as well as retro-reflecting devices.