大口径长焦距暗弱星模拟器系统设计

Design of Optical System of Large Aperture Long Focal Length Star Simulator

为提高星模拟器口径及焦距,提出以大口径长焦距离轴反射式系统作为星模拟器的准直光学系统。首先,研究星模拟器参数需求及光学系统构型优缺点,确定准直光学系统结构;其次,优化光学系统参数,分析像质情况;最后,测试系统各项实际指标,验证光学系统可行性。优化结果表明:系统口径为Φ510 mm,焦距为5000 mm,系统波像差≤0.049λ,点列图RMS半径≤2.589μm,各视场MTF接近衍射极限,畸变量≤0.002%,场曲≤0.2 mm,完全满足设计要求。测试实验结果表明:系统波像差0.0616λ,星等模拟范围+7~+12 Mv,星等模拟误差0.08 Mv,实现了对高星等恒星的精确模拟。

In order to improve the aperture and focal length of the star simulator,the collimating optical system of the star simulator is proposed based on the reflector system of the long focal distance axis.Firstly,the parameter requirements of the star simulator and the advantages and disadvantages of the optical system configuration are studied,and the collimation optical system structure is determined.Secondly,the optical system parameters are optimized and the image quality is analyzed.Finally,t he practical indexes of the system are tested to verify the feasibility of the optical system.The optimization results show that the aperture of the system isΦ510 mm,the focal length is 5000 mm,the wave aberration of the system is≤0.049λ,the RMS radius of the point diagram is less than 2.589μm,the MTF of each field of view is close to the diffraction limit,the distortion is less than 0.002%,and the field curvature is less than 0.2 mm.The experimental results show that the wave aberration of the system is 0.0616λ,the magnitude simulation range is+7~+12 Mv,and the magnitude simulation error is 0.08 Mv,which realizes the accurate simulation of high magnitude stars.