理论分析光偏振对导光管光传输效率的影响  

Theoretical study on the influence of light polarization on light transmission efficiency of light pipes

作　　者：欧阳金龙[1] 周幸 左浩毅[2] 王春苑[1] 高庆龙 OUYANG Jinlong;ZHOU Xing;ZUO Haoyi;WANG Chunyuan;GAO Qinglong(College of Architecture and Environment,Sichuan University,Chengdu,610065,China;College of Physics,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学建筑与环境学院,成都610065 [2]四川大学物理学院,成都610065

出　　处：《哈尔滨工业大学学报》2023年第4期145-150,共6页Journal of Harbin Institute of Technology

基　　金：国家重点研发计划项目:“西南民族村寨防灾技术综合示范”(2020YFD11007)。

摘　　要：光传输效率(LTE)是衡量导光管采光性能的最重要参数。在导光管LTE计算中,常常忽略了光线在管中若干次镜面反射引起的光偏振的累积效应。因此,为厘清连续镜面反射引起光偏振的累积效应,通过光学理论分析与公式推导,在确定光偏振对镜面反射材质反射率的影响之后,首次揭示了导光管内壁反射率随反射次数的变化规律,以及反射率的变化对导光管LTE的影响。结果表明:单束自然光线每投射到管内壁一次,就会产生一次光偏振,并在两个正交分量上产生不同的反射率,即ρ⊥和ρ‖,且ρ⊥≥ρ‖;历次反射中ρ⊥和ρ‖数值保持不变,但整体反射率会随反射次数增多而逐渐变大,故导光管内光损速率会不断减缓;由此提出了导光管中单束光线的LTE表达式,为建立复杂光源下LTE数学计算模型,奠定了理论基础。Light transmission efficiency(LTE)is the most important parameter to evaluate the daylighting performance of light pipes.In the calculations of LTEs of light pipes,the cumulative effect of light polarization caused by several specular reflections in pipes is often neglected.Therefore,in order to make clear the cumulative effect of light polarization generated by continuous specular reflection,through optical theoretical analysis and formula derivations,after determining the influence of light polarization on the reflectivity of specular reflection materials,this article for the first time clarified the change rule of the reflectivity of interior surface of a light pipe with the number of reflections and the influence of the variation of reflectivity on the LTE of the light pipes.The results indicated that each time a light beam projects on the pipe􀆳s inner surface,there will be a light polarization that produces different reflectivity on the two orthogonal components,i.eρ⊥andρ‖andρ⊥≥ρ‖;In every reflection,the values ofρ⊥andρ‖remains fixed,but the overall reflectivity will gradually rise with the increase of reflection times,so the light loss rate will continue to slow down.Finally,the LTE expression of a single beam in a light pipe is derived,which lays a theoretical foundation for the establishment of the LTE mathematical calculation models under complex light sources.

关 键 词：累积效应 镜面反射 整体反射率 反射次数 光损速率 

分 类 号：TU113[建筑科学—建筑理论]