一种高性能双视场长波红外光学系统
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摘要
设计了一款高性能的紧凑型双视场长波红外光学系统,该光学系统由前固定组、变倍调焦组、后固定组、中继组组成。采用机械补偿变焦方式、光瞳匹配技术、二次成像和二次折叠,有效地对光学系统纵向和横向尺寸进行了约束,外形包络在220 mm×95 mm(局部135 mm)×50 mm(局部110mm)范围内,系统紧凑,体积小。通过光学和结构材料的优选搭配及光学系统参数优化配置,在-40℃~70℃范围内,控制了光学系统热差,光学系统光轴稳定,小视场光轴稳定性<0.04 mrad,大/小视场转换光轴平行性<0.1 mrad;应用该光学系统的热像仪性能高,MRTD(3 cyc/mrad)=0.07 K,NETD=30 m K。设计结果表明光学系统像质良好,满足热像仪使用要求。
A compact dual fields of view infrared optical system with high performance is designed, which consists of a front fixed group, a zoom focus group, a rear fixed group and a relay group. The vertical and horizontal dimensions of the optical system are designed to be minimum by adopting mechanically compensated zoom, the entrance pupil matching the exit pupil, reimage, and twice folding optical axis. The three-dimensional figure is 220 mm×95 mm×50 mm. The thermal aberration is controlled between-40 to 70℃ by choosing optical material and structural material, and optimizing the optical system parameters. The line of sight of the optical system is stabilized. The error of the line of sight of the narrow field of view is less than 0.04 mrad after environment test, the error of the line of sight between the narrow field of view and the wide field of view is less than 0.1mrad. The performance of the imager of the LWIR optical system is improved, the MRTD value is 0.07 K at 3 cyc/mrad, the NETD valueis 30 m K. The optical systems' imaging quality is perfect, it can be satisfied to the imager
A compact dual fields of view infrared optical system with high performance is designed, which consists of a front fixed group, a zoom focus group, a rear fixed group and a relay group. The vertical and horizontal dimensions of the optical system are designed to be minimum by adopting mechanically compensated zoom, the entrance pupil matching the exit pupil, reimage, and twice folding optical axis. The three-dimensional figure is 220 mm×95 mm×50 mm. The thermal aberration is controlled between-40 to 70℃ by choosing optical material and structural material, and optimizing the optical system parameters. The line of sight of the optical system is stabilized. The error of the line of sight of the narrow field of view is less than 0.04 mrad after environment test, the error of the line of sight between the narrow field of view and the wide field of view is less than 0.1mrad. The performance of the imager of the LWIR optical system is improved, the MRTD value is 0.07 K at 3 cyc/mrad, the NETD valueis 30 m K. The optical systems' imaging quality is perfect, it can be satisfied to the imager
引文
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[2]何红星,冯生荣.双像双视场红外光学系统[J].红外技术,2007,29(1):12-16.He Hongxing,Feng Shengrong.IR optical system with dual field of view and dual-image[J].Infrared Technology,2007,29(1):12-16.
[3]陈吕吉,李萍,冯生荣,等.中波红外消热差双视场光学系统设计[J].红外技术,2011,33(1):1-3.Chen Lvji,Li Ping,Feng Shengrong,et al.Athermal design for MWinfrared dual field-of-view optical system[J].Infrared Technology,2011,33(1):1-3.
[4]张葆,崔恩坤,洪永丰.红外双波段双视场共光路光学系统[J].光学精密工程,2015,23(2):395-401.Zhang Bao,Cui Enkun,Hong Yongfeng.Infrared MWIR/LWIRdual-FOV common-path optical system[J].Optics and Precision Engineering,2015,23(2):395-401.
[5]张以谟,应用光学[M].北京:电子工业出版社,2008:636-658.Zhang Yimo.Applied Optics[M].Beijing:Publishing House of Electronics Industry,2008:636-658.
[6]李景镇.光学手册[M].西安:陕西科学技术出版社,2010:845-855.Li Jingzhen.Handbook of Optics[M].Xian:Publishing House of Shanxi Science and Technology,2010:845-855.
[7]Warren J Smith.Practical Optical System Layout[M].New York:Mc Graw-Hill,1997.
[8]Warren J Smith.Modern Lens Design[M].New York:Mc Graw-Hill,2005.