中文摘要：

为了提高光能利用率和照度均匀性,减小炫光的产生,需要对LED路灯进行二次光学配光设计.本文以空间光折射定律为基础,对LED光线空间和路面区域进行一一对应的网格划分,结合优化的双向迭代算法生成自由曲面透镜,实现矩形光斑输出.仿真结果表明,配光后的LED整体光能利用率为90.4%,能量基本被限制30m×13m的矩形区域内,水平方向和垂直方向的照度均匀度分别为83.2%和71.7%.当LED以30m间隔平行排列时,可以在路面形成宽度约为14m的光斑,垂直照度均匀度提高为77.2%.据此开模制造的LED路灯配光曲线为蝙蝠翼型,横向和纵向±62°和±40°范围内的平均照度分别为31.17lx和25.72lx,满足国家道路照明标准,实验验证了该透镜设计算法的可行性和实用性.

英文摘要：

In order to improve the light efficiency and illumination uniformity and reduce glare, LED street light need secondary light distribution design. Based on the basis of space Snell law, combing with bidirectional iteration algorithm and equivalent grid dividing, this paper realizes one-to-one correspondence between LED emergent ray space and specific spot on the road. A freeform surface lens was generated, and it can convert light distribution of the LED to rectangle. Simulation results show that LED＇s light energy is almost limited in a rectangular area of 30 mX 13 m, the whole light efficiency is 90.4 %. The horizontal illumination uniformity and vertical illumination uniformity can reach 83.2 % and 71.7% respectively. When multiple LEDs are arranged in 30 m spacing, the facula width on the pavement is about 14m. At this time, vertical illumination uniformity increased to 77.2%. Experiment results show that the light distribution curve of LED street light is bat-wing distribution. The horizontal and vertical average illumination is 31. 17 lx and 25.72 Ix, and energy is limited in ±62° and ± 40°, respectively. It can meet requirements of national standard for lighting design of urban road, which prove the feasibility and practicability of the lens design algorithm.