用于轴对称的两级光学聚光器的非成像二次反射镜

Non-imaging secondary(NIS) for axial symmetrical two-stage optical concentrator

本文给出了一种用于轴对称的两级光学聚光器的非成像二次反射镜(non-imaging secondary,NIS),的工作原理.在一般的情况下,NIS是由并不限于常用的二次曲线或复合抛物线的高次曲线围绕一次反射镜的中心轴旋转而形成.本文讨论了确定这样一种曲线的待定系数的求解方法.在举例的计算中,除了运用常用的二次曲线,还特别运用了光学中至今从未用过的三次方曲线,用以说明NIS可以由一般的高次曲线给出.作为一个特例,我们也讨论了新的光学元件在太阳能聚光方面的应用,在这些应用中,本文着重讨论了NIS在太阳光的盘面效应的影响下的聚光效果.

Non-imaging reflector may present the advantage to eliminate the dark image in beam down 2-stage optical concentrator. The working principle of the non-imaging secondary （NIS） for an axial symmetric concentrator is revealed. The geometrical shape of NIS can generally be high order surface not restricted to the quadratic one in imaging optics or the CPC in non-imaging optics, The article has described the method to determine the parameters of the curve. To break the tradition in optics, we have demonstrated in the article that beside the quadratic curve, cubic curve can be equally used to form NIS. In the respect of solar energy application, we have made the discussion on the behavior of NIS for solar disc effect and how a new parameter can be used to optimize the design.