Study on Influence of Source Spectra on Retro-Reflection Coefficient
YANG Yong1, 2, ZHANG Zhi-yong1, 2, LI Xu3, ZHU Chuan-zheng1, 2, ZHU Li-wei1, 2, SUN Yue1, 2
1. Research Institute of Highway, Ministry of Transport, Beijing 100088, China 2. Key Laboratory of Road Sagety Ministry of Communications PRC, Beijing 100088, China 3. College of Physics Science and Technology, Hebei University, Baoding 071002, China
Abstract：Based on emission spectra of light sources and reflectivity curve of retroreflective materials，relative relations and changing trend of retroreflection coefficient of materials in different light sources was researched through data fitting. The tests were carried on the standard A light source test system. One kind of test results are emission spectra of halogen light source，xenon light source and white LED with different color temperature. And another kind of results are reflectivity curve of retroreflective materials with five different colors such as red, yellow, white, green and blue. Then the correction factors of retroreflection coefficient in different light sources were obtained by test results and data fitting. It shows that the change inlight source spectra has no effect on retroreflection coefficient of white material, which has continuous reflectivity curve in the range of visible light, but has some effect on retroreflection coefficient of the other color materials. Compared with halogen light source，white LED and xenon light source can increase retroreflection coefficient of red and yellow materials, and the increase in the color temperature of light source will decrease retroreflection coefficient of red and yellow materials by the maximum of 47.7% and 4.9%. Conversely, retroreflection coefficient of green and blue materials will increase by the maximum of 16.5% and 28.9%.
[1] Zhang Gaoqiang, Zhang Jianjun, Shen Jingjun. World Road Meeting. 16th. Lisbon, 2010, 409. [2] Guirong Y, Shirley J, Dyke. Mechanical Systems and Signal Processing, 2012, 28(4): 195. [3] Jennifer A, Rice, Douglas A. Engineering Structures, 2012, 34(1): 173. [4] Miguel S, Rrieto, Alastair R. Image and Vision Computing, 2009, 27(6): 673. [5] BAI Yuan-yuan, ZHU Chuan-zheng(白媛媛，朱传征). China Illuminating Engineering Journal(照明工程学报), 2010, 21 (5): 7. [6] Yuan Jinghe, Chang Shengjiang, Li Sumel. Optics Communications, 2002, 209: 75. [7] Chao Kenghsing, Liao Chunda, Yang Bingjun. Optics Communications, 2011, 284: 5221. [8] CIE54.2—2001，Retroreflection: Definition and Measurement. [9] Teschner H, Feldmann J, Scholz M. November 2007, ATZ worldwide, 2007, 109(11): 5. [10] Kang B, Yong B, Park K. International Journal of Automotive Technology, 2010, 11(5): 737. [11] Roland L, Flavio F. ATZ Worldwide, 2001, 103(7-8): 2. [12] Stephan P, Rainer N, Vladimir K. ATZ Worldwide eMagazine, 2011, 113(1): 10. [13] Hubert S, Ing. Erwin M. ATZ Worldwide eMagazine, 2011, 113(10): 24.
