用于道路均匀照明的LED自由曲面透镜设计  

LED Freeform Lens Design for Street Uniform Illumination

作　　者：贺志华[1] 董前民[1] 王少雷[1] 李敏[1] 

机构地区：[1]中国计量学院光学与电子科技学院,浙江杭州310018

出　　处：《照明工程学报》2014年第4期85-89,共5页China Illuminating Engineering Journal

摘　　要：鉴于LED在道路照明应用中的复杂性和特殊性,以非成像光学为基础,提出了一种新颖的用于道路均匀照明透镜设计方案。运用微分几何原理,建立自由曲面面型的一阶拟线性双曲型偏微分方程,并在matlab中进行数值求解,将所得面型数据导入SolidWorks中建立透镜模型,该透镜将LED朗伯分布转化为道路照明所需的蝙蝠翼分布。通过Tracepro对所建透镜进行光线追迹,结果表明10m处目标面的整体均匀度在85%以上,能量利用率为89.2%。在对扩展光源配光时,该光学系统仍保持较好的照明效果,不仅有效照明区域符合预期,且照度均匀度优于0.80。用DIALux模拟该透镜组成的5×10式模组的路灯系统的照明效果,结果显示路面照度均匀度达0.83,符合国家标准。Given the complexity and particularity of the LED in the application of street lighting , this paper presents a new lens design method for street uniform lighting based on non-imaging optics .Using the theory of differential geometry to set up the first-order quasi-linear hyperbolic partial differential equations of the freeform lens surface , and solve it by numerical solution in matlab , using the data of the lens profile , the lens model is established in SolidWorks .The designed lens can convert the Lambert distribution of the LED into the bat wing distribution for street lighting .The designed optical system simulated with ray-tracing in TracePro, the results show that the overall uniformity of the 10m distance target plane is above 85%, and the efficiency is 89 .2%.This optical system still maintains good lighting effect when point at extended light source .Not only is the effective illumination area in line with expectations , but also can keep the uniformity above 80%.The street lighting system , which uses the designed lens consisting of 5 ＆#215;10-in modular, simulated the lighting effects in DIALux .The results show that the uniformity achieves 83% on road surface , which conform the national standard .

关 键 词：偏微分方程 LED光学设计 均匀度 道路照明 

分 类 号：TM923.34[电气工程—电力电子与电力传动]