多焦点菲涅尔透镜阵列的设计与性能分析-物理学专业论文.docxVIP

浙江工业大学硕士学位论文 浙江工业大学硕士学位论文 万方数据 万方数据 多焦点菲涅尔透镜阵列的设计与性能分析 摘 要 汽车前照灯是汽车照明系统中较为重要的一部分，它能有效提高 行车安全性。目前，由于汽车灯源种类繁多，设计汽车前照灯的方法 也不断推陈出新。本文设计的多焦点菲涅尔透镜能适用于以激光二级 管等聚束性较好的光源作为照明光源的前照灯设计中。 本文利用了菲涅尔透镜的聚光性能，在此基础上增加了偏转阵列 结构。两者相结合，使得光线经过透镜阵列后既有汇聚的作用，又能 使焦点发生一定的偏离，并落到设定位置，形成设定的图形。 首先，文中菲涅尔透镜主要以几何光学定律和非成像光学理论为 设计核心。应用相关软件,先对单个菲涅尔透镜进行考察。分析不同 直径、焦距和环带宽度的情况下，对焦点造成的影响。通过比较落在 焦平面上的焦斑半径、亮度和光效等数据，选出合理的一组，作为组 成阵列的单元透镜。 其次，本文分别设计了以“工”、“大”两字为目标图形的透镜 阵列，将图形各点与阵列中各单元透镜形成的焦点建立对应关系。得 到的透镜一侧是菲涅尔透镜的阵列，另一侧是具有偏转效应的斜面。 仿真后所得图形符合设计要求。 最后，本文将焦距不同的两种透镜组合到同一个透镜阵列中，使 得平行光经过阵列之后在不同焦平面上形成不同的图形。光学仿真结 果显示此方法合理可行。 关键字：非成像光学，配光设计,菲涅尔透镜，多焦点，阵列透 镜，蜂窝式 I DESIGN AND PERFORMANCE ANALYSIS OF MULTI-FOCUS FRESNEL LENS ARRAY ABSTRACT Headlamps are an important part of car’s lighting system which can improve the driving safety effectively. At present, more and more design methods of automobile headlamp are brought forth to adapt for great variety of light source. The multi-focus Fresnel lens array can be applied to the headlamp design with the collimated light source. In the present thesis, a lens array is employed to gather the lights emitted from source. The lens array is a combination of a Fresnel lens array and a deflection array in back-to-back way. The incident rays can be redirected to the target place by the lens array to yield a desired illuminance pattern. Firstly, the design method for the Fresnel lens is based on the geometrical optics laws or nonimaging optics theory. A single Fresnel lens is investigated by using some optical or design software, such as Tracepro and Solidworks. The effect on focus, which is caused by different diameter, focal length and band width, has been discussed in detail. The ideal one with small focus radius and uniform luminance is selected as the unit lens. II Secondly, a honeycomb lens array which can yield the Chinese characters “工” and “大” pattern on its focal plane is carried out in this thesis. The array can be obtained by using the relation between the pattern and the