弱光探测器中复合抛物面聚光镜

基于非成像光学的原理,设计并研制了一种用于弱光探测器的复合抛物面聚光镜.提出基于遗传算法的优化设计聚光镜电子光学系统的新方法,将探测器阳极对光电子的接收率作为遗传进化的目标函数,把复合抛物面聚光镜系统的几何结构参量和电参量作为优化设计的搜索变量,通过控制遗传算法的遗传进化方向,进行全局优化调整.仿真实验结果表明,优化后的聚光镜在会聚光线的同时可以对光电子实现有效的会聚.当入射角为30°时,光透过率高于75%,电子收集率为100%,可以满足具有反射式光电阴极和大探测面积的弱光探测器要求.

Optimization Design of compound Parabolic Concentrator in the Weak Light Detector

A Compound Parabolic Concentrator (CPC) is designed based on the principle of non-imaging optics to develop a novel Photomultiplier Tube (PMT).An efficient solution is proposed for the optimization design of CPC electron-optical parameters based on the Genetic Algorithm (GA).GA simulating the evolutionary mechanism of nature is a global optimization parallel searching method.The photoelectron collecting rate of anode is used as the fitness function of GA and the structure and electrical parameters as the optimization searching variables.By controlling the GA inheritance evolution direction,global optimization of CPC electron-optical system is realized.Simulation experimental results show that the optimized CPC is able to focus light and photoelectrons efficiently.As an example,for light incident angle of 30°,corresponding light transmission rate of above 75% and the photoelectron collecting rate of almost 100% are able to achieved respectively with the CPC.Such a design can be applied to develop the PMT of large detection area,and reflective photocathode for photon detection.