高效大尺寸短焦距菲涅尔透镜设计

摘要

In order to reduce the area of solar cell,minimize the size and cut down the cost of the concentrator solar system,the partitioning method is adopted to design a Fresnel lens with high efficiency,short focal length and high concentrator ratio.The large round or square size Fresnel lens is separated into three parts: the central area,refractive area and total refractive area,and the computational equations of partitioning method are derived.A Fresnel lens is designed through this method,whose focal length and diameter ratio is 075 and concentration ratio is high up to 1000.TracePro simulation shows that the light concentrating efficiency of the designed Fresnel lens can be up to 8875%.The Fresnel lens designed through partitioning method possesses the advantages of high optical efficiency,high concentration ratio and short focal length,and the cost and weight of concentrator solar cells system can be reduced.%为减少聚光太阳能系统中太阳能电池面积和聚光系统体积,缩短系统纵向尺寸和降低系统成本,采用分区方法设计大口径、短焦距、高聚光比的菲涅尔透镜.把圆形或方形菲涅尔透镜分成中心区、折射区及全反射区,推导了分区法计算公式.用该方法设计了一个焦径比为075、聚光比为1000的高聚光比菲涅尔透镜,用TracePro软件对设计的菲涅尔透镜进行了光学仿真,聚光效率可达8875%.该菲涅尔透镜具有焦距短、高聚光比、高效率、易加工等优点,可降低系统的体积及成本.