变焦光学系统的景/焦深延拓及其分析
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摘要
变焦光学系统在连续变焦过程中,由于变焦曲线的计算和加工精度,导致实际像面离焦,成像质量下降。变焦系统的特点是长焦距对应窄视场,短焦距对应宽视场。将波前编码技术应用于变焦系统,在系统的光瞳面设置相位掩模,则扩展了原系统的焦深和景深,使调制传递函数对离焦不敏感,同时提高短焦距宽视场的边缘成像质量。文章对原系统和应用波前编码技术的新系统的成像特性进行了分析和对比,随后讨论了掩模板的相位因子对系统的景深、焦深延拓以及对像质的稳定作用。仿真显示:变焦波前编码光学系统对离焦不敏感,可以很好地扩大系统的焦深和景深、稳定边缘视场的像质,具有很高的实用价值。
Because the calculating and processing accuracy of zoom curve lead to imaging defocused, the image quality of the zoom system declined. The features of zoom system are that long focal length corresponds to narrow field of view and short focal length corresponds to wide field of view. The masked aperture surface can extend the depth of focus and field of view of system, while it improves the imaging quality of the fringe field of view. The technology makes the modulated of function(MTF) insensitive to the defocus. The imaging characteristics of original system and the wavefront coding system are analyzed. The simulation results present that the system insensitive to the defocus has a large rang of depth of focus and depth of field while stabilizing the fringe field angle image quality, which has more value to apply.
Because the calculating and processing accuracy of zoom curve lead to imaging defocused, the image quality of the zoom system declined. The features of zoom system are that long focal length corresponds to narrow field of view and short focal length corresponds to wide field of view. The masked aperture surface can extend the depth of focus and field of view of system, while it improves the imaging quality of the fringe field of view. The technology makes the modulated of function(MTF) insensitive to the defocus. The imaging characteristics of original system and the wavefront coding system are analyzed. The simulation results present that the system insensitive to the defocus has a large rang of depth of focus and depth of field while stabilizing the fringe field angle image quality, which has more value to apply.
引文
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[2] 徐新行,张飞,夏文波.两档变焦距电视用摆动式镜组切换机构设计[J].仪器仪表学报,2018,39(01):84—91.Xu Xinhang,Zhang Fei,Xia Wenbo.Design of swinging mirror group switching mechanism for two stage zoom TV[J].Chinese Journal of Scientific Instrument,2018,39(01):84—91.
[3] 费继扬,李林.红外大变倍比连续变焦距系统光学被动式无热化设计[J].光学技术,2017,43(01):1—6.Fei Jiyang,Li Lin.Optical passive thermo mechanical design of infrared zoom ratio continuous zoom system[J].Optical Technique,2017,43(01):1—6.
[4] 韩西达,赵勇志,王志臣,等.一种大口径连续变焦距系统的结构设计[J].红外技术,2016,38(03):203—206.Han Xida,Zhao Yongzhi,Wang Zhichen,et al.Structure design of a large aperture continuous zoom system[J].Infrared Technology,2016,38(03):203—206.
[5] 李宏壮,张振铎.20倍双组联动变焦距光学系统设计[J].光学学报,2015,35(2):0222003.Li Hongzhuang,Zhang Zhenduo.Design of zoom optical system with 20× double group linkage[J].Acta Optica Sinica,2015,35(2):0222003.
[6] 李宏壮.三组式伸缩型高倍率变焦距光学系统设计[J].激光与光电子学进展,2016,53(12):233—239.Li Hongzhuang.Design of three group telescopic high magnification zoom optical system[J].Laser & Optoelectronics Progress,2016,53(12):233—239.
[7] Jo Sunhyung,Park Sungchan.Design and analysis of an 8x four-group zoom system using focus tunable lenses[J].Opt.Express 2018,26(10):13370—13382.
[8] Khatsevich T N,Volkova K D.Stabilization of the exit pupil in an optical zoom sight with variable magnification [J].Journal of Optical Technology,2017,84(9):605—612.
[9] Liu Jiang,Miao Erlong,Sui Yongxin,et al.Optimization of wavefront coding phase mask applied to 5X-40X Micro-Objectives simultaneously[J].Journal of The Optical Society of Korea,2015,19(5):487—493.
[10] Chen Xinhua,Zhou Jiankang,Shen Weimin.Analytical computation of the derivative of PSF for the optimization of phase mask in wavefront coding system[J].Optics Express,2016,24(18):21070—21080.
[11] Van Nhu Le,Zhigang Fan,Quoc Dung Duong.To extend the depth of field by using the asymmetrical phase mask and its conjugation phase mask in wavefront coding imaging systems[J].Appl.Opt.2015,54(12):3630—3634.
[12] Guo Xiaohu,Dong Liquan,Zhao Yuejin,et al.Imaging and image restoration of an on-axis three-mirror cassegrain system with wavefront coding technology[J].Applied Optics,2015,54(10):2798—2805.
[13] 闫锋,张学军.应用波前编码技术的离轴三反系统的设计及其分析[J].红外与激光工程,2009,37(6):1048—1052.Yan Feng,Zhang Xuejun.Design and analysis of off-axis three mirror system using wavefront coding technology[J].Infrared and Laser Engineering,2009,37(6):1048—1052.
[14] Liu Ming,Dong Liquan,Zhao Yuejin,et al.Stationary phase analysis of generalized cubic phase mask wavefront coding[J].Optics Communications,2013,298:67—74.