为了减小光伏发电聚光系统的轴向尺寸，使聚光系统的厚度更薄、质量更轻，讨论设计了一种透射式双面菲涅耳聚光镜。通过设计，使光线在通过双面菲涅耳聚光镜的前表面环带后进入相应的后表面环带，减少了光能损失，使太阳能电池获得的能量密度更高。推导并给出了双面菲涅耳透镜的后表面环带设计公式。用光学设计软件LightTools模拟了双面菲涅耳聚光镜的光学能力，并对模拟结果进行了分析评价。给出了一个口径为200 mm，焦距为120 mm，F 数为0.6 的双面菲涅耳聚光镜设计实例，在波段为380~760 nm，太阳张角为0.55°时，聚光系统的聚光效率达到85%，与相同口径相同焦距的传统菲涅耳透镜相比，聚光效率提高了21.1%。

A double-side Fresnel lens for a solar energy collector has been designed with the characteristics of lighter weight and smaller axial dimension. Rays going through the front surface ring and entering the corresponding rear surface ring, which reduces the energy loss. The energy of the solar cell obtained by the double-side Fresnel lens is with higher energy density. The design formula for the rear surface Fresnel structure is derived. The optical condenser performance of a double-side Fresnel lens is simulated with an optical design software LightTools. A double-side Fresnel lens with diameter of 200 mm, focal length of 120 mm and F number of 0.6 is designed as an example. The applied illumination is from 380 nm to 760 nm wavelength and with a solar angular subtense of 0.55°. Design results show that theoretical improvement in collection efficiency is 21.1% compared with that of a similar conventional Fresnel lens.