模块化多焦点式和环面聚焦式菲涅尔透镜的设计及光学性能分析

Design and Optical Performance Analysis of the Modularity Multi Focus Type Fresnel Lens and Ring Surface Focusing Type Fresnel Lens

基于菲涅尔透镜设计原理,提出模块化多焦点式和环面聚焦式菲涅尔透镜的设计方法,并进行了理论设计与模拟.结果表明:(1)采用模块化多焦点式菲涅尔透镜可使焦斑能量在接收面重新分布、焦斑总体能量均匀;(2)对于环面聚焦式菲涅尔透镜,环状焦面越多、越密集,接收面上的能量分布将越均匀.两种透镜结构均能很好的提高聚光辐照均匀性.

Fresnel Lens is an important part of CPV（concentration photovoltaic） system,the non- uniform illumination distribution and hot spot effect issues would reduce the efficiency of the system. Based on the design principles of Fresnel lens, modularity multi focus type Fresnel lens （MMF） and ring surface focusing type Fresnel lens（RSF）were designed and simulated. Results show that： （1）The MMF Fresnel lens could bring about energy re-distribution on focal point, which could result in uniform irradiance;（2）The more annular focal plane and the more inten- sive,the energy distribution more uniform for receiving surface. Both the structure of the lens can very well increase concentrated irradiation uniformity.