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兵工学报 ›› 2020, Vol. 41 ›› Issue (8): 1539-1548.doi: 10.3969/j.issn.1000-1093.2020.08.008

• 论文 • 上一篇    下一篇

焦深延拓的透雾连续变焦光学系统设计

丁贵鹏, 陶钢, 庞春桥, 王小峰   

  1. (南京理工大学 能源与动力工程学院, 江苏 南京 210094)
  • 收稿日期:2019-10-11 修回日期:2019-10-11 上线日期:2020-09-23
  • 通讯作者: 陶钢(1962—),男,研究员,博士生导师 E-mail:taogang@njust.edu.cn
  • 作者简介:丁贵鹏(1982—), 男, 博士研究生。 E-mail: dingguipeng@163.com

Design of Fog Transmission Zoom Optical System with Focal Depth Extension

DING Guipeng, TAO Gang, PANG Chunqiao, WANG Xiaofeng   

  1. (School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China)
  • Received:2019-10-11 Revised:2019-10-11 Online:2020-09-23

摘要: 针对目前雾霾天气搜寻-跟踪的成像需求,同时出于降低光学系统加工装调难度、减弱热效应对像质影响的考虑,设计了一款加入波前编码技术的大焦深、大靶面、连续变焦、近红外光学系统。利用光学设计软件,通过在系统孔径光阑处放置立方位相编码板并优化位相板参数,获得系统变焦范围内任意焦距处的最大拓展焦深,分析了不同焦距处系统的焦深延拓倍率。该系统工作波段为1.20~1.67 μm,具有良好的透雾性能,焦距为18~90 mm,探测器靶面为全画幅,搜索视场较大,有利于发现目标;在不同变焦位置,短焦端焦深最大为传统系统的6.43倍,长焦端焦深最大为传统系统的3.21倍,大大改善连续变焦系统对像面定位精度的敏感性,从而使该系统不仅具有优良像质,也使设计、加工、装调要求更加宽松,并有利于消除热效应的影响。

关键词: 变焦光学系统, 透雾霾, 波前编码, 焦深扩展

Abstract: A near infrared zoom optical system with large focal depth and large field of view, which uses the wavefront coding technology, is designed to meet the current imaging requirements of search-tracking in fog, rain and snow, reduce the difficulty of processing and adjusting of optical system, and lessen the influence of thermal effect on image quality. Optical design software can be used to obtain the maximum extended focal depth at any focal length in the zoom range by placing a cubic phase encoding plate at the aperture of the system and optimizing the parameters of the phase plate. The extended focal depth ratio of the system at different focal lengths is analyzed. The operating band of the system is 1.20- 1.67 μm, which has good imaging performance in fog. The focal length of the system is 18- 90 mm. The target surface of detector is the full frame, and the system has a large search field of view, which is beneficial to find a target. In different zoom positions, the focal depth of the zoom optical system is 6.43 times of that of the traditional system at short-EFL, and is 3.21 times of that of the traditional system at long-EFL, which greatly reduces the sensitivity of the continuous zoom system to image positioning accuracy. This method not only makes the system have good image quality, but also makes the requirements of design, processing and assembly more relaxed, and is conducive to eliminate the influence of thermal effect.

Key words: zoomopticalsystem, nearinfraredoptics, wavefrontcoding, focusdepthexpansion

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