利用几何光学和菲涅耳公式(Fresnel formula),在楔形聚光器的横截面上推导出楔形聚光器的几何聚光比、光线接收范围、透明材料的折射率、楔形顶角四者之间的关系.在此基础上,通过优化设计聚光器的反射面,提出了一种新型楔形聚光器.这种聚光器的反射面是由一部分平面、一部分抛物面组成,使折射到抛物面上的光线直接被反射到出射面上,从而提高楔形聚光器的聚光比.理论计算结果表明,当楔形顶角相同,透明介质相同且折射率为1.5时,在透射率大于90%的条件下,新型楔形聚光器的聚光比可比普通楔形聚光器提高约28%,但聚光均匀性有所下降.实验测试结果也验证了理论计算结果的准确性.总体而言,对于低倍光伏聚光系统,聚光均匀性要求不高,新型楔形聚光光伏组件具有较好的聚光性能及能量输出性能,具有应用价值.%Based on the law of geometrical optics and Fresnel Formula, the geometric concentrating ratio,the range of receiving light,the refractive index of transparent material and the relationship between four wedge angle parameters can be deduced on the cross section of a wedge concentrator. And on this basis,by optimizing the de-sign of concentrator reflective surface, a improved wedge concentrator, combined with plane and paraboloid, has been designed. The light refracted on paraboloid is reflected directly to the image plane,thus improving concentra-ting ratio of concentrator. Through mathematicl calculation, concentrating ratio of the improved wedge condenser can be improved about 28% higher than that of the normal wedge condenser,but the focusing uniformity declined. Also,experimental measurement can verify the accuracy and reliability of the mathematicl calculation results. As for low concentrating photovoltaic undemanding of focusing uniformity,the improved wedge concentrator has the ad-vantage of high concentrating performance and high capacity for energy output. The improved wedge concentrator has wide prospect of application and exploitation.
展开▼
