基于扩展光源的双自由曲面均匀照明设计方法

Design Method for Double Free-Form Surface with Uniform Illumination Based on an Extended Light Source

提出一种基于双自由曲面的均匀照明设计方法,根据几何光学理论和能量映射关系,设计了距高比为1的双自由曲面透镜。通过将扩展光源和透镜表面离散化,对扩展光源进行反向追迹构建新的双自由曲面。借助光学仿真软件模拟了光学性能,结果表明:在距离光源1000 mm处的目标面实现了半径为1000 mm的均匀圆形照度分布,照度均匀度达92.3%,该方法有效提升了基于扩展光源的目标面的照度均匀性,设计过程无需对自由曲面反馈优化,大大缩短设计时间,过程简易方便。

A uniform lighting design method based on a double free-curved surface is proposed herein.According to the theory of geometrical optics and energy mapping relationship,a double free-form surface lens is designed with a distance-toheight ratio of one.By discretizing the extended light source and lens surface,a new double free-form surface lens profile is constructed by inverse tracing the extended light source.The optical properties are simulated by using optical simulation software.The results have shown that uniform circular illumination distribution with a radius of 1000 mm is achieved on the target surface 1000 mm away from the extended light source,and the illumination uniformity is 92.3%.This method can effectively improve the illumination uniformity of the target surface based on an extended light source,and the design process of the free-form surface does not depend on feedback optimization.Accordingly,the design time is reduced and the process becomes simple and convenient.