大变倍比大相对孔径连续变焦红外光学系统研制
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摘要
提出了一种新型连续变焦结构形式,在现有经典四组元机械补偿变焦模型的基础上,添加一个独立的变倍组,利用二个变倍组级联的方式获得超大变倍比,并推导了数学模型.在此基础上,针对制冷型中波探测器,研制了一套大变倍比大相对孔径连续变焦红外光学系统,解决了大相对孔径红外变焦系统变倍比难以提高的问题.该光学系统工作波长3. 7～4. 8μm,冷光阑效率100%,可实现从焦距6 mm至330 mm连续变焦,在F数恒定为2的同时,变倍比高达55倍.该系统仅包含八片镜片,其中三片镜片独立运动实现变焦.设计结果显示,该系统在6 mm至330 mm的焦距范围内,变焦曲线平滑、像质良好.实验室测试和外场成像结果显示,该系统在整个焦距范围内成像效果清晰,达到设计要求,验证了这种新型连续变焦数学模型的应用效果.
A newcontinuous zoom structure was described,and a newindependent zoom group was added on the classical four-group-mechanical-compensation. And larger zoom ratio was achieved by the way of two zoom groups cascading. This mathematical model was deduced. Then,according to the cooled mid-wave infrared detector,a continuous-zoom infrared optical system with large zoom ratio and large relative aperture was designed. And the problem that it's hard for a zoom optical system to achieve both large zoom ratio and large relative aperture was solved. This optical system can zoom from 6 mm to 330 mm,which means it can reach 55 x zoom ratio while the F number is 2 constantly.The working waveband was 3. 7 ～ 4. 8 μm,the cold shield efficiency was 100%. It contains only eight lenses,three of them move in order to change the focal length. The result shows that the zoom curves are quite smooth and the image quality is quite good in the whole zoom range. The laboratory test and the out-door imaging experiment shows that the image quality is quite good in the whole zoom range. It proves the application effect of this newkind of zoom model,and shows that the system reaches its design goal.
A newcontinuous zoom structure was described,and a newindependent zoom group was added on the classical four-group-mechanical-compensation. And larger zoom ratio was achieved by the way of two zoom groups cascading. This mathematical model was deduced. Then,according to the cooled mid-wave infrared detector,a continuous-zoom infrared optical system with large zoom ratio and large relative aperture was designed. And the problem that it's hard for a zoom optical system to achieve both large zoom ratio and large relative aperture was solved. This optical system can zoom from 6 mm to 330 mm,which means it can reach 55 x zoom ratio while the F number is 2 constantly.The working waveband was 3. 7 ～ 4. 8 μm,the cold shield efficiency was 100%. It contains only eight lenses,three of them move in order to change the focal length. The result shows that the zoom curves are quite smooth and the image quality is quite good in the whole zoom range. The laboratory test and the out-door imaging experiment shows that the image quality is quite good in the whole zoom range. It proves the application effect of this newkind of zoom model,and shows that the system reaches its design goal.
引文
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[6]YANG Ming-yang,YANG Hong-tao,QU Rui,et al. De-sign of high ratio middle infrared continuous zoom opticalsystem[J]. Acta Photonica Sinica,(杨明洋,杨洪涛,曲锐等. 80倍中波红外连续变焦光学系统设计.光子学报),2017,46(5):0522003-1~0522003-7.
[7]Sanson M C,Cornell J. MWIR Continuous zoom with largezoom range[C]. Proc. SPIE,Infrared Technology and Appli-cations XXXVI,2010,7660:1-12.
[8]TAO Chun-kan. Design of zoom optical system[M]. Bei-jing:National Defense Industry Press,(陶纯勘.变焦距光学系统设计,北京:国防工业出版社),1988.
[9]YU Dao-yin,TAN Heng-ying. Engineering optics[M]. Bei-jing:China Machine Press,(郁道银,谈恒英.工程光学,北京:机械工业出版社),2006.
[10]NONG Wen-jie,JIN Ning. Evaluation of Binary OpticsManufacturing Parameters[J]. Infrared Technology,(农文捷,金宁.二元光学工艺参数计算.红外技术),2004,26(6):13-16.
[11]DING Xue-zhuan,WANG Xin,LAN Wei-hua,et al. De-sign of Re-imaging MIR Optical System Employing Refrac-tive and Diffractive Optical Elements[J]. Infrared Tech-nology,(丁学专,王欣,兰卫华,等.二次成像中波红外折射衍射光学系统设计.红外技术),2009,31(8):450-457.
[12]Buralli D A,Morris G M,Rogers J R. Optical perform-ance of holographic kinoforms[J]. Applied Optics,1989,28(5):976-983.
[2]BAI Yu,XING Ting-wen,JIANG Ya-dong. Advances ininfrared spectrum zoom imaging system research[J]. Spec-troscopy and spectral analysis,(白瑜,邢廷文,蒋亚东.国外红外光谱连续变焦成像系统的研究进展,光谱学与光谱分析),2014,34(12):3419-3423.
[3]Kim H S,Kim C W,Hong S M. Compact mid-wavelengthinfrared zoom camera with 20:1 zoom range and automaticathermalization[J]. Optical Engineering,2002,41(7):1661-1667.
[4]CAO Chao,LIAO Zhi-yuan,BAI Yu,et al. A new com-pound zoom optical system[J]. Actaopticasinica,(操超,廖志远,白瑜,等.一种新型复合变焦光学系统.光学学报),2017,37(11):1108001-1~1108001-7.
[5]ZHOU Hao. Study on midwave infrared continuous zoom op-tical system with a large zoom range[D]. Changchun:Changchun Institute of optical,Fine Mechanics and Physics,Chinese Academy of Sciences,(周昊.高变焦比中波红外连续变焦光学系统研究,长春:中国科学院长春光学精密机械与物理研究所),2014.
[6]YANG Ming-yang,YANG Hong-tao,QU Rui,et al. De-sign of high ratio middle infrared continuous zoom opticalsystem[J]. Acta Photonica Sinica,(杨明洋,杨洪涛,曲锐等. 80倍中波红外连续变焦光学系统设计.光子学报),2017,46(5):0522003-1~0522003-7.
[7]Sanson M C,Cornell J. MWIR Continuous zoom with largezoom range[C]. Proc. SPIE,Infrared Technology and Appli-cations XXXVI,2010,7660:1-12.
[8]TAO Chun-kan. Design of zoom optical system[M]. Bei-jing:National Defense Industry Press,(陶纯勘.变焦距光学系统设计,北京:国防工业出版社),1988.
[9]YU Dao-yin,TAN Heng-ying. Engineering optics[M]. Bei-jing:China Machine Press,(郁道银,谈恒英.工程光学,北京:机械工业出版社),2006.
[10]NONG Wen-jie,JIN Ning. Evaluation of Binary OpticsManufacturing Parameters[J]. Infrared Technology,(农文捷,金宁.二元光学工艺参数计算.红外技术),2004,26(6):13-16.
[11]DING Xue-zhuan,WANG Xin,LAN Wei-hua,et al. De-sign of Re-imaging MIR Optical System Employing Refrac-tive and Diffractive Optical Elements[J]. Infrared Tech-nology,(丁学专,王欣,兰卫华,等.二次成像中波红外折射衍射光学系统设计.红外技术),2009,31(8):450-457.
[12]Buralli D A,Morris G M,Rogers J R. Optical perform-ance of holographic kinoforms[J]. Applied Optics,1989,28(5):976-983.