| 可见光/红外双波段离轴三反光学系统优化设计 |
| 投稿时间：2021-03-26 修订日期：2021-03-30 点此下载全文 |
| 引用本文：韩修来,聂亮,任梦茹.可见光/红外双波段离轴三反光学系统优化设计[J].红外,2021,42(8):1~6 |
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| 基金项目:西安市智能探视感知重点实验室项目（201805061ZD12CG45） |
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| 中文摘要:为满足多波段、长焦距、大孔径、紧凑结构的设计要求，对反射式光学系统进行了研究。以同轴三反系统的成像理论为设计基础，为避免光学系统遮拦同时提高成像质量，利用Zemax软件介绍了一种优化离轴三反光学系统的方法。与采用ZPL语言的控制优化相比，该方法更加简便、直观，且无需使用复杂非球面，仅采用曲面圆锥系数即可满足设计要求，大大降低了加工、检测的成本和难度。采用视场离轴方式设计出了一种焦距为1000 mm、口径为6 in、视场角为2.2°×0.22°的可见光/中波红外双波段离轴三反光学系统。仿真结果表明，其3～5 μm波段在空间频率17 lp/mm处的全视场调制传递函数(Modulation Transfer Function, MTF)值大于0.4，0.4～0.7 μm波段在空间频率50 lp/mm处的全视场MTF值大于0.7。该系统的成像质量良好，接近衍射极限。 |
| 中文关键词:光学设计 光学系统 同轴三反 视场离轴 优化 |
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| Optimal Design of Visible/Infrared Dual-Band Off-Axis Three-Reflection Optical System |
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| Abstract:In order to meet the design requirements of multi-band, long focal length, large aperture and compact structure, the reflective optical system is studied. Based on the imaging theory of the coaxial three-mirror system, in order to avoid the existence of blocking in the optical system and improve the imaging quality，the design uses Zemax optical software to introduce a method to optimize off-axis three-reflection optical system. Compared with the control optimization based on ZPL language, the method is more convenient and intuitive. It does not need to use complex aspheric surface and only uses the conic coefficient of curved surface to meet the design requirements, which greatly reduces the cost and difficulty of processing and testing. Using the off-axis field-of-view, a visible and mid-wave infrared dual-band off-axis three-reflection optical system with a focal length of 1000 mm, the diameter of 6 in and a field-of-view of 2.2°×0.22° is designed. The simulation results show that MTF of the full field-of-view is greater than 0.4 at the spatial frequency of 17 lp/mm in the 3—5 μm band, and MTF of the full field-of-view is greater than 0.7 at the spatial frequency of 50 lp/mm in the 0.4—0.7 μm band. The imaging quality of the system is good, close to the diffraction limit. |
| keywords:optical design optical system coaxial three-mirror off-axis field-of-view optimization |
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