紧凑型大变倍比中波红外连续变焦光学系统设计
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摘要
针对致冷型中波红外640×512凝视型焦平面探测器,设计了一个30×连续变焦光学系统。介绍了由无后固定组的变焦物镜组和中继透镜组组成的连续变焦系统的设计思路,不仅给出了系统在短焦、中焦、长焦3个位置的像质情况,还分析了反映全焦距范围内像质的离焦量和畸变。实验结果表明:该系统工作波段3.7μm～4.8μm,可以实现18mm～540mm连续变焦,全焦距范围内的离焦量都在焦深以内,长焦段最大畸变接近于0,短焦段最大畸变小于3%。该系统具有大变倍比、结构紧凑、变焦轨迹平滑、变焦行程短等优点,可用于红外光电探测和跟踪系统。
For the cooled 640×512 detector with staring focal plane array,a mid-wave infrared(MWIR)continuous zoom optical system with 30×zoom range was presented.The design idea of the continuous zoom system consisting of the zoom objective lens group and the relay lens group without the rear fixed group was introduced.The image quality of the system at three positions of short effective focal length(EFL),middle EFL and long EFL is given;moreover,the amount of defocus and the distortion of image quality reflected in the full focal length range was analyzed.The experiment results indicate that the optical system with 3.7μm～4.8μm working waveband can realize 18 mm ～540 mm continuous zoom,the defocus amount of the full focal length is less than the depth of focus,the maximum distortion of the long EFL area is close to 0,and that of the middle EFL is less than 3%.It has the advantages of large zoom range,simple structure,short zoom path,and smooth zoom locus,which can be used for infrared optical observation and tracking system.
For the cooled 640×512 detector with staring focal plane array,a mid-wave infrared(MWIR)continuous zoom optical system with 30×zoom range was presented.The design idea of the continuous zoom system consisting of the zoom objective lens group and the relay lens group without the rear fixed group was introduced.The image quality of the system at three positions of short effective focal length(EFL),middle EFL and long EFL is given;moreover,the amount of defocus and the distortion of image quality reflected in the full focal length range was analyzed.The experiment results indicate that the optical system with 3.7μm～4.8μm working waveband can realize 18 mm ～540 mm continuous zoom,the defocus amount of the full focal length is less than the depth of focus,the maximum distortion of the long EFL area is close to 0,and that of the middle EFL is less than 3%.It has the advantages of large zoom range,simple structure,short zoom path,and smooth zoom locus,which can be used for infrared optical observation and tracking system.
引文
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[12]YANG Weijin,SUN Qiang.Design of middle infraredcontinuous zoom system[J].Chinese Journal of Op-tics and Applied Optics,2010,3(2):164-169.杨为锦,孙强.中波红外连续变焦系统设计[J].中国光学与应用光学,2010,3(2):164-169
[13]XU Yan,LI Shanwu,YANG Xinhua,et al.Fabri-cation techniques of IR Si lenses[J].Infrared andLaser Engineering,2006,35(3):359-361.徐岩,李善武,杨新华,等.红外材料硅透镜加工工艺研究[J].红外与激光工程,2006,35(3):359-361.
[14]FISCHER R E.Optical system design[M].2nd ed.USA:SPIE Press,2008.
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[16]LIU Feng,XU Xiping,SUN Xiangyang,et al.Designof infrared(IR)hybrid refractive/diffractive lensesfor target detecting/tracking[J].Acta Optica Sinica,2010,30(7):2084-2088.刘峰,徐熙平,孙向阳,等.折/衍射混合红外目标搜索/跟踪光学系统设计[J].光学学报,2010,30(7):2084-2088.
[2]TAO Chunkan.Zoom focus optics system design[M].Bering:National Defense Industry Press,1988.陶纯堪.变焦距光学系统设计[M].北京:国防工业出版社,1988.
[3]MUHAMMAD N.A.Design of a multiple-field-of-viewoptical system for 3-to 5-μm infrared focal-plane arrays[J].Opt.Eng.,2003,42(6):1704-1714.
[4]Yoram A,Isak B,Reuven S."Topaz"-A novel de-sign of a high magnification athermalized 1:30zoomin the MWIR[J].SPIE:Infrared Technology andApplications XXX,2004,5406:97-106.
[5]XU Zhaodong,LIU Xin,Dong Tao.Design of air-borne high resolution and continuous magnificationIR thermal image[J],Infrared and Laser Engineer-ing,2007,36(5):619-621.许照东,刘欣,董涛.机载高分辨率连续变焦红外热像仪设计[J].红外与激光工程,2007,36(5):619-621
[6]ZHOU Hao,LIU Ying,SUN Qiang.Mid-infraredzoom optical system with ratio of 25[J].Acta OpticaSinica,2012,32(4):0422001.周昊,刘英,孙强.25倍中红外连续变焦光学系统设计[J].光学学报,2012,32(4):0422001
[7]JIANG Lun,HUANG Wei.Lens design for opticalsystem of high zoom ratio[J].Acta Optica Sinica,2011,31(12):1222006.江伦,黄玮.高变倍比变焦距系统设计[J].光学学报,2011,31(12):1222006
[8]YANG Mingyang,YANG Hongtao,et.al.Design ofhigh ratio middle infrared continuous zoom opticalsystem[J].Acta Photonica Sinica.2017,46(5):88-94.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[J].光子学报,2017,46(5):88-94.
[9]LI Ling,WANG Yongtian.An approach on the calcu-lation of Gaussian parameters of zoom lenses[J].Transactions of Beijing Institute of Technology,2003,23(4):424-427.李林,王涌天.变焦距物镜高斯光学参数的求解[J].北京理工大学学报,2003,23(4):424-427..
[10]SANSON M C,CORNELL J.MWIR continuouszoom with large zoom range[J].SPIE:InfraredTechnology and Applications XXXVI, 2010,7660:76601X.
[11]SANSON M C,CORNELL J,ROY B,et al.Devel-opment of MWIR continuous zoom with large zoomrange[J].SPIE:Infrared Technology and Applica-tions XXXVII,2011,8012,80122F.
[12]YANG Weijin,SUN Qiang.Design of middle infraredcontinuous zoom system[J].Chinese Journal of Op-tics and Applied Optics,2010,3(2):164-169.杨为锦,孙强.中波红外连续变焦系统设计[J].中国光学与应用光学,2010,3(2):164-169
[13]XU Yan,LI Shanwu,YANG Xinhua,et al.Fabri-cation techniques of IR Si lenses[J].Infrared andLaser Engineering,2006,35(3):359-361.徐岩,李善武,杨新华,等.红外材料硅透镜加工工艺研究[J].红外与激光工程,2006,35(3):359-361.
[14]FISCHER R E.Optical system design[M].2nd ed.USA:SPIE Press,2008.
[15]RIEDL M J.Optical Design fundamentals for infra-red systems[M].2nd ed.USA:SPIE Press,2001.
[16]LIU Feng,XU Xiping,SUN Xiangyang,et al.Designof infrared(IR)hybrid refractive/diffractive lensesfor target detecting/tracking[J].Acta Optica Sinica,2010,30(7):2084-2088.刘峰,徐熙平,孙向阳,等.折/衍射混合红外目标搜索/跟踪光学系统设计[J].光学学报,2010,30(7):2084-2088.