用于光纤耦合的无衍射光束研究

在光纤耦合理论及圆锥透镜产生无衍射光束理论的基础上提出了无衍射光束在光纤耦合中的方法.相对于其他方法,无衍射光束更容易耦合进入光纤,特别是单模光纤,并且在其最大准直距离内耦合效率几乎不变,可以减小装调难度.对此方法进行理论分析,并进行实验,加工了光纤耦合使用的圆锥透镜,其锥角为10°,通光半径为5mm.波长为0.632...     

用于亚公里级三维成像的全光相机主物镜设计

The plenoptic camera can refocus after imaging, and obtain the position and direction information of the target at the same time with one exposure. Compared with the active distance measurement method and the traditional passive distance measurement method, the depth measurement method based on the plenoptic camera has the advantages of being difficult to detect and easy to calibrate. The plenoptic camera 3D imaging technology is a computational imaging technology that integrates the front-end optical system and the back-end information processing. The current research works mainly focus on the back-end information processing algorithm et al. There are few reports on the research of the front-end optical system. Therefore, the design of the front-end optical system was researched. Firstly, a calculation model was established for the depth resolution of a plenoptic camera based on multi-eye vision and the influence of optical system performance parameters was analyzed such as focal length and F-number on the object depth resolution. Secondly, the influence of factors was analyzed such as the blocking ratio of the two-mirror optical system and the magnification of the secondary mirror on the system parameters. Finally, a plenoptic camera main objective optical system for sub-kilometer-scale 3D imaging was designed comprehensively considering the design, processing, assembly, and ranging performance. The focal length of the system is 500 mm, the total length of the system is less than 163 mm, the telephoto ratio is less than 1/3, and the working temperature range is ?40 -70 ℃. The full field of view MTF in 80 lp/mm is better than 0.3 at different temperatures. If the plenoptic camera uses this objective and a sub-pixel recognition accuracy algorithm of 1/8 pixel, a depth resolution of less than 5 m can be obtained at 0.5 km.     

滚仰式导引头红外光学系统设计

滚仰式红外光学系统由物镜前组、折转镜组和成像后组组成,其平台内框架俯仰范围可达到90,外框架可以实现360滚转,使光学系统观察视场覆盖整个前半球。光学系统实现了100%冷光阑效率。为适应较大的工作环境温度变化,对光学系统开展了被动无热化设计,给出了被动无热化实现的计算公式,并利用虚拟色差技术,快速确定了满足无热化条件的光学系统最优初始解。针对制冷型红外光学系统的冷反射效应,给出了冷反射诱导温差（NITD）的计算公式,并对敏感表面进行了优化控制。设计结果表明,光学系统焦距为58 mm,视场大小为4.0,F数为2.0,在-50~60℃工作温度范围内系统MTF值接近衍射极限,并对冷反射效应具有较好的抑制能力。经样机测试,光学系统成像清晰稳定,性能良好,满足设计及使用要求。     

激光半主动光学系统设计与可视化检测

激光制导是当今最常用的制导方式之一,激光半主动光学系统性能的优劣直接影响其制导精度。提出了一种激光半主动光学系统像差优化设计方法,通过赋予不同的球差与离焦量实现激光半主动光学系统初始结构设计,通过对非对称像差优化实现光斑均匀化设计,设计并研制了折射式激光半主动光学镜头,光学系统工作波段1064 nm,视场为±9.2°,光斑大小5 mm,能量分布均匀;为解决激光半主动镜头不能单独检测的问题,提出了利用色差特性实现镜头低成本可视化检测的原理,并搭建了激光半主动光学镜头的可视化检测系统。镜头的测试结果表明,光斑大小满足设计要求,低成本可视化检测系统大幅提高了镜头检测效率,并易于工程化,批量化生产。