[1] [1] BAI Yu, XING Tingwen, LI Hua, et al. Advances in foreign MWIR lens with high ratio[J]. Infrared and Laser Engineering, 2015, 44(3): 795-802.

[2] [2] WANG Yifeng. On the field of view of infrared optical system[J]. Infrared, 2016, 37(7): 1-9.

[3] [3] TAN Songnian, YU Xiao, ZHANG Hongwei, et al. Progress and key technologies of infrared optical system with variable F-number[J]. Infrared Technology, 2016, 38(5): 367-373.

[4] [4] CHEN Boliang, LI Xiangyang. Infrared Imaging Detectors for Space Applications[M]. Beijing: Science Press, 2016.

[5] [5] YU Daoyin, TAN Hengying. Engineering Optics Basics Tutorial[M]. Beijing: Mechanical Industry Press, 2007.

[6] [6] Vizgaitis J N. Dual f/number optics for third generation FLIR systems [C]//Infrared Technology & Applications XXXI, 2005, 5783: 875-886.

[7] [7] Deslis A. Optical design of a warm shield for the 8 to 12 micron wavelength region[C]//Proceedings of SPIE, 2006, 6288: 628803.

[8] [8] LIU Yang, AN Xiaoqiang, DENG Jian. Removal of stray radiation from warm shields in cooled infrared optical systems[J]. Journal of Applied Optics, 2012, 33(1): 186-190.

[9] [9] CHANG Songtao, TIAN Qijie, HE Fengyun, et al. Design of varying f /number of cooled infrared detectors based on spherical reflecting warm shield[J]. Acta Physica Sinica, 2017, 66(15): 52-63.

[10] [10] Moskal R, Booker G, Williamson M, et al. High Altitude Observatory (HALO) Uprade[R]. AEROMET INC TULSA OK, 2000.

[11] [11] NAHUM Gat, ZHANG J , MING D L, et al. Variable cold stop for matching IR cameras to multiple f-number optics[C]//Proceedings of SPIE, 2007, 6542: 65420Y.

[12] [12] NAHUM Gat, ZHANG Jingyi. Continuous variable aperture for forward looking infrared cameras based on adjustable blades: USA, 8462418 B1[P]. 2013-06-11.

[13] [13] Jeffrey P Yanevich, Eric J Griffin, Michael L Brest, et al. Variable aperture mechanism for cryogenic environment, and method: USA, 2014/0363149 A1[P]. 2014-12-11.

[14] [14] Eric J Griffin, Jerry Hershberg. Method for embedded feedback control for bi-stable actuators: USA, 2014/0363150A1[P]. 2014-12-11.

[15] [15] Jeffrey P Yanevich, Michael L Brest, Kenneth L McAllister, et al. Thermal control in variable aperture mechanism for cryogenic environment: USA, 2014.0363151A1[P]. 2014-12-11.

[16] [16] King D F, Radford W A, Patten E A , et al. 3(rd)-generation 1280?720 FPA development status at Raytheon Vision Systems - art. no. 62060W[J]. Proceedings of SPIE, 2006, 6206: 62060W.

[17] [17] King D F, Graham J S, Kennedy A M, et al. 3rd-generation MW/LWIR sensor engine for advanced tactical systems[C]//Proceedings of SPIE, 2008, 6940: 903-914.

[18] [18] WANG Zhengguan, LI Yanjin. Adjustable light column for cold screen of Dewer bottle: CN2456147[P]. 2001-10-24.

[19] [19] LIU Yingqi, WANG Jianli, ZENG Wei, et al. Device capable of changing cold diaphragm and imaging wave band of infrared camera: CN103792761A [P]. 2014-05-14.

[20] [20] DU B, LIU C, HU L. Design of imaging lens of large field of view of medium wave[C]// International Conference on Optical Instruments and Technology 2018, 10616: 446-452.

[21] [21] DU Xiaoyu, PENG Qingqing, LI Jiangyong. Design of cooled midinfrared optical system with variable F-number[R]. The 11th Research Institute of China Electronics Technology Group Corp. (China), 2022.