一种环面焦斑菲涅耳聚光器的设计与分析  

Design and Analysis of Ring-Shaped-Focus Fresnel Concentrator

作　　者：张丽[1] 陈志明[1] 董前民[1] 梁培[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：《激光与光电子学进展》2012年第9期150-155,共6页Laser & Optoelectronics Progress

基　　金：浙江省自然科学基金(Y407370)资助课题

摘　　要：在聚光光伏系统中,聚光光斑辐照度的不均匀性会降低光伏系统的光电转换效率,且会在光伏电池表面形成热斑效应,灼伤光伏电池。基于多焦点方法,设计了一种环形焦斑菲涅耳太阳能聚光镜,每环小透镜在焦平面上具有一个环面焦斑,且环面焦斑在接受面上均匀依次排列,实现均匀聚光。以口径400mm,具有200环,焦斑半径20mm,F数为0.8的圆状环面焦斑菲涅耳聚光器为实例,用TracePro模拟平行太阳光垂直照射下时的照度图,得到其理想光学效率为86.77%,光能均匀度为0.8,表明环状焦斑菲涅耳聚光器具有较高的光能利用率和照明均匀性。分析了焦斑均匀性与聚光器F数的关系,当F数一定时,焦斑均匀性随着聚光器口径的增大而逐渐降低。The non-uniform illumination distribution on the solar cell will reduce the solar-to-electric power conversion efficiency and decrease the service life of the cell in concentration photovoltaic system.Moreover,the hot-spots formd on the cell surface will quickly break the cell.Based on multifocal method,we design the ring-shaped-focus Fresnel concentrator,in which each ring of the Fresnel lens has one focus.Taking a Fresnel concentrator whose diameter is 400 mm,ring number is 200 and focused spot radius is 20 mm as an example,under simulated sunlight,using Tracepro software we get an illumination diagram with energy uniform by distributed on the round surface.The optical efficiency is 85.24% and the homogenization is 0.8.The annular focal spot Fresnel concentrator holds higher light utilization and illumination uniformity.Moreover,when the F number is fixed,the focal spot uniformity gradually reduces with the increase of the concentrator diameter.

关 键 词：光学设计 能量均匀性 多焦点设计 菲涅耳透镜 环面焦斑 

分 类 号：O436[机械工程—光学工程]