氙灯光源太阳模拟器辐照衰减器设计方法

针对应用于太阳模拟器辐照衰减器设计上的不足,提出一种新的衰减器设计方法,旨在提高其辐照均匀性。基于光学扩展量计算衰减器上的网孔面积,对会聚光路的辐射通量进行调制;利用聚光镜环带法,理论上分析衰减器上的辐射分布;利用网孔非均匀分布的结构对会聚光路的辐射分布进行调制,给出具体设计参数;对比分析了网孔均匀分布和非均匀分布对辐射调制效果和辐照均匀性的影响。实验表明:安装网孔非均匀分布的衰减器,调节氙灯功率,能够连续输出0.1~1.0个太阳常数的辐照度;基于网孔非均匀分布的衰减器对辐射分布调制后,光斑内辐照不均匀度降低率最高为48.7%,低辐照不均匀度下可以实现辐照度的大范围调整,对提高太阳模拟器的使用性能具有一定的借鉴意义。

Design Method of Irradiance Attenuator for Solar Simulator of Xenon Lamp

Aiming at the deficiency of the design of irradiance attenuators for solar simulators,we proposed a new design method of attenuators to improve their irradiance uniformity.According to the theory of Etendue,the mesh area of an attenuator was calculated and the radiation flux in the convergent optical path was modulated.Furthermore,the radiation distribution on the attenuator was theoretically analyzed by the zoned method of condenser.Then,the structure of non-uniform mesh distribution was designed to modulate the radiation distribution in the convergent optical path and the specific design parameters were provided.In addition,the effects of attenuators with uniform and non-uniform mesh distributions on radiation modulation and irradiance uniformity were compared and analyzed.The results suggest that the irradiance of 0.1--1.0 solar constant can be output continuously after an attenuator with non-uniform mesh distribution was installed and the power of xenon lamp was adjusted.Besides,after the modulation of radiation distribution,the maximum reduction rate of irradiance non-uniformity in the spots is 48.7%,and the wide adjustment of irradiance at low irradiance non-uniformity can be realized,which has certain reference significance for improving the performance of solar simulators.