滚仰式导引头红外光学系统设计
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摘要
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。
IR optical system of roll-elevation seeker was composed of object lens front group, turning mirrors group and imaging rear group. The pitch frame had ±90° moving range and the roll frame had360° moving range, so that the combination of rolling and pitching enabled the optical system to realize all over the front hemisphere field. The optical system achieved 100% cold shield efficiency. In order to adapt to the large variation of working environment temperature, the athermal design was used, and the formulas to realize athermal design were given. By using the technique named dummy chromatic aberration, the best initial solution of athermal design was found quickly. For controlling the Narcissus effect of this cooled IR optical system, the formula to compute the NITD were given, and the sensitive surface of Narcissus effect was optimized. The design result showed that the optical system working parameters were the effective focal length of 58 mm, field of view of 4.0 °, F/# of 2.0, and the MTF of the optical system was close to the diffraction limit when working temperature changed from-50 ℃ to 60 ℃.The narcissus effect was also controlled effectively. The optical system met the design requirements by imaging test.
IR optical system of roll-elevation seeker was composed of object lens front group, turning mirrors group and imaging rear group. The pitch frame had ±90° moving range and the roll frame had360° moving range, so that the combination of rolling and pitching enabled the optical system to realize all over the front hemisphere field. The optical system achieved 100% cold shield efficiency. In order to adapt to the large variation of working environment temperature, the athermal design was used, and the formulas to realize athermal design were given. By using the technique named dummy chromatic aberration, the best initial solution of athermal design was found quickly. For controlling the Narcissus effect of this cooled IR optical system, the formula to compute the NITD were given, and the sensitive surface of Narcissus effect was optimized. The design result showed that the optical system working parameters were the effective focal length of 58 mm, field of view of 4.0 °, F/# of 2.0, and the MTF of the optical system was close to the diffraction limit when working temperature changed from-50 ℃ to 60 ℃.The narcissus effect was also controlled effectively. The optical system met the design requirements by imaging test.
引文
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[8]Qu Hemeng,Zhang Xin.Design of athermalized infrared optical system with high-speed switching and compact dualFOV[J].Chinese Optics,2014,7(8):622-629.(in Chinese)曲贺盟,张新.高速切换紧凑型双视场无热化红外光学系统设计[J].中国光学,2014,7(8):622-629.
[9]Dun Xiong,Tao Yu,Meng Junhe.Narcissus suppression in dual-FOV IR scanned imaging systems[J].Infrared and Laser Engineering,2010,39(4):732-735.(in Chinese)顿雄,陶玉,孟军合.双视场红外扫描成像系统冷反射抑制[J].红外与激光工程,2010,39(4):732-735.
[10]Luo Shoujun,Xia Yinhui,Yang Ningning,et al.Longwavelength infrared continuous zoom scanning optical system[J].Chinese Optics,2015,8(1):107-113.(in Chinese)骆守俊,夏寅辉,杨宁宁,等.扫描型长波红外连续变焦光学系统[J].中国光学,2015,8(1):107-113.
[11]Zhang Bao,Hong Yongfeng,Shi Guanghui.Application of non-uniformity correction to stray radiation suppression of infrared optical system[J].Optics and Precision Engineering,2008,16(12):2412-2427.(in Chinese)张葆,洪永丰,史光辉.非均匀性矫正在红外杂散光辐射抑制中的作用[J].光学精密工程,2008,16(12):2412-2427.
[12]Lei Li,Wu Xiaojing,Meng Junhe,et al.Study on the method for finding initial solution of IR optical system athermalization design[C]//Guidance and Fuze Information Net Association,CSAA,2005.(in Chinese)雷丽,吴晓靖,孟军和,等.红外光学系统无热化设计初始解确定方法研究[C]//中国航空学会制导与引信专业信息网学术交流会,2005.
[2]Zhang Xin,Jia Hongguang.90°off-axis angle infrared optical system of roll-pitch seeker[J].Infrared and Laser Engineering,2013,42(1):143-147.(in Chinese)张鑫,贾宏光.90°离轴角红外滚仰式导引头光学系统[J].红外与激光工程,2013,42(1):143-147.
[3]Shang Chao,Wang Junping,Wu Junbiao.Simulation of object-image transformation for roll-pitch seeker with slick chain[J].Infrared and Laser Engineering,2011,40(9):1768-1773.(in Chinese)尚超,王军平,吴军彪.滚仰式光滑环物象变换关系仿真研究[J].红外与激光工程,2011,40(9):1768-1773.
[4]Fan Huitao,Liu Daijun.Development trends of short-range dogfight IR air to air missile[J].Infrared and Laser Engineering,2005,34(5):564-568.(in Chinese)樊会涛,刘代军.红外近距格斗空空导弹发展展望[J].红外与激光工程,2005,34(5):564-568.
[5]Fu Qiang,Zhang Xin.Athermalization of the medium-wave infrared optical system based on chalcogenide glasses[J].Infrared and Laser Engineering,2015,44(5):1467-1471.(in Chinese)付强,张新.基于硫系玻璃的中波红外光学系统无热化设计[J].红外与激光工程,2015,44(5):1467-1471.
[6]Mi Shilong,Mu Da,Mu Meng.Athermalization of a compact LWIR optical system[J].Infrared and Laser Engineering,2015,44(10):3032-3036.(in Chinese)米士隆,牟达,牟蒙.紧凑型长波红外光学系统无热化设计[J].红外与激光工程,2015,44(10):3032-3036.
[7]Bai Yu,Liao Zhiyuan,Liao Sheng,et al.Infrared dual band athermal optical system with common aperture[J].Optics and Precision Engineering,2016,24(2):268-277.(in Chinese)白瑜,廖志远,廖胜,等.共孔径消热差红外波波段光学系统[J].光学精密工程,2016,24(2):268-277.
[8]Qu Hemeng,Zhang Xin.Design of athermalized infrared optical system with high-speed switching and compact dualFOV[J].Chinese Optics,2014,7(8):622-629.(in Chinese)曲贺盟,张新.高速切换紧凑型双视场无热化红外光学系统设计[J].中国光学,2014,7(8):622-629.
[9]Dun Xiong,Tao Yu,Meng Junhe.Narcissus suppression in dual-FOV IR scanned imaging systems[J].Infrared and Laser Engineering,2010,39(4):732-735.(in Chinese)顿雄,陶玉,孟军合.双视场红外扫描成像系统冷反射抑制[J].红外与激光工程,2010,39(4):732-735.
[10]Luo Shoujun,Xia Yinhui,Yang Ningning,et al.Longwavelength infrared continuous zoom scanning optical system[J].Chinese Optics,2015,8(1):107-113.(in Chinese)骆守俊,夏寅辉,杨宁宁,等.扫描型长波红外连续变焦光学系统[J].中国光学,2015,8(1):107-113.
[11]Zhang Bao,Hong Yongfeng,Shi Guanghui.Application of non-uniformity correction to stray radiation suppression of infrared optical system[J].Optics and Precision Engineering,2008,16(12):2412-2427.(in Chinese)张葆,洪永丰,史光辉.非均匀性矫正在红外杂散光辐射抑制中的作用[J].光学精密工程,2008,16(12):2412-2427.
[12]Lei Li,Wu Xiaojing,Meng Junhe,et al.Study on the method for finding initial solution of IR optical system athermalization design[C]//Guidance and Fuze Information Net Association,CSAA,2005.(in Chinese)雷丽,吴晓靖,孟军和,等.红外光学系统无热化设计初始解确定方法研究[C]//中国航空学会制导与引信专业信息网学术交流会,2005.