离轴非旋转对称叠加方形光斑均匀聚光菲涅尔透镜

Off-axis Non-rotationally Symmetric Superposition Square Spot Uniform Concentration Fresnel Lens

针对传统点聚焦菲涅尔透镜聚光分布均匀性差以及聚焦光斑形状与太阳能电池片不匹配的缺点,采用离轴非旋转对称叠加方法进行了方形光斑均匀聚光菲涅尔透镜设计,透镜采用方形非旋转对称结构,设计过程中通过在透镜中心截取一方形小孔来降低聚焦光斑中心辐照度峰值,改善接收面聚光分布,以提高聚光均匀性.采用光线追迹法模拟并分析了小孔边长、离轴偏移量、离轴聚焦距等参量对聚光性能的影响,结果表明:采用该方法设计的透镜聚焦光斑形状为方形,聚光均匀度高达90%.

Aiming at the defects of the poor uniformity of concentration distribution and the focused spotshape does not match with solar cells in the traditional point focus Fresnel lens,square spot uniformconcentration Fresnel lens was designed by using the method of off-axis non-rotationally Symmetric Superposition.The square non-rotating symmetry structure was adopted in the lens,a square hole was intercepted in the center of the lens when the lens was designed,which can reduce the center peak irradiance of the focal spot and improve the concentrated distribution on the receiving surface in order to improve the uniformity of the spot light.The ray tracing method has been used to simulate and analyze the influence on the condensing performance caused by structure parameter of lens such as offaxis offset,the length of hole and the off-axis focus length.The results show that the shape of the focus spot of the lens designed by this method is square,and the concentration uniformity is up to 90%.