动目标模拟自由曲面离轴四反系统设计  

Design of Free-Form Surface Off-Axis Four-Mirror Optical System forDynamic Target Simulation

作　　者：张丹妮 聂亮[1] 宋艳龙 Zhang Danni;Nie Liang;Song Yanlong(School of Optoelectronic Engineering,Xi’an Technological University,Xi’an 710021,Shaanxi,China)

机构地区：[1]西安工业大学光电工程学院,陕西西安710021

出　　处：《激光与光电子学进展》2024年第15期300-307,共8页Laser & Optoelectronics Progress

基　　金：陕西省教育厅重点科学研究计划(20JY029)。

摘　　要：以三级像差理论为基础,分析同轴四反光学系统的像差,构建出包含权重分配的初级像差系数和结构约束的混合目标函数,并采用改进的粒子群算法对其求解,获取高像质和特定布局的初始结构。通过离轴处理及引入XY多项式自由曲面优化初始结构,设计出一款焦距为365 mm、工作波段为0.4~0.7μm、8~12μm、F数为2,以及矩形视场为6°×2°的自由曲面离轴四反光学系统。结果表明,该系统能量集中度高,最大网格畸变为2.12%,全视场内可见波段光学传递函数均优于0.5@50 lp/mm,红外波段调制传递函数(MTF)曲线接近衍射极限,成像质量良好,与数字微镜器件(DMD)结合可满足光电跟踪系统的动态目标模拟需求。Based on the third-order aberration theory,the aberration of the coaxial four-mirror optical system is analyzed,and the mixed objective function including the primary aberration coefficient of weight distribution and structural constraints is constructed.The improved particle swarm optimization algorithm is used to solve it,and the initial structure with high image quality and specific layout is obtained.Through off-axis processing and the introduction of XY polynomial free-form surface to optimize the initial structure,a free-form surface off-axis four-mirror optical system with focal length of 365 mm,operating band of 0.4‒0.7μm,8‒12μm,F-number of 2,and rectangular field of view of 6°×2°is designed.The results show that the system achieves high energy concentration,the maximum mesh distortion is 2.12%,the optical transfer function exceeding 0.5@50 lp/mm across the entire field of view in the visible band,and the modulation transfer function(MTF)curves in the infrared band almost reach the diffraction limit.The optical system demonstrates excellent imaging quality,when combined with a digital micro-mirror device(DMD),satisfies the dynamic target simulation requirements of the optoelectronic tracking system.

关 键 词：光学设计 动目标模拟 离轴四反 自由曲面 矩形视场 

分 类 号：O435[机械工程—光学工程] TH745[理学—光学]