Design of 40x wide band continuous zoom optical system
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摘要: 为了实现对远处目标的瞄准、识别与跟踪，光电跟踪系统往往需要其光学系统可连续变焦，并且具有大变倍比、宽波段、光轴一致性高等特性。详细阐述了连续变焦光学系统的基本构造形式、初始结构参数估算等，并在确定了相关技术参数的基础上，设计了一种变倍比为40×的宽波段连续变焦光学系统。设计的连续变焦光学系统全部使用球面镜，易于加工，成像质量较好，各视场MTF值在150 lp/mm处均大于0.2，并且凸轮曲线平滑，无拐点，杂散光控制较好，对系统影响很小。最后通过外景试验测试，该系统光轴一致性小于0.1 mrad，系统的各项性能指标都可满足设备的使用要求，为光电跟踪系统的工程化提供了参考价值。Abstract: In order to achieve the aiming, identification and tracking of long-distance targets, photoelectric tracking systems often require their load systems to be continuous zoom, and have high requirements of large zoom ratio, wide band and consistency of optical axis. In this paper, the analysis of structural form and initial structural parameter of calculation of the continuous zoom system are introduced in detail, and on the basis of clarifying the relevant technical parameters, zoom ratio of 40, wide-band visible continuous zoom optical system is designed. The continuous zoom optical system is a designed to use spherical mirrors, which are easy to process, and the MTF value of each field of view is above 0.2 at 150 lp/mm, smooth cam curve, no inflection points, and good stray light control which has little impact on the system. Finally, through the location test, the system has good consistency of optical axis, which is less than 0.1mrad. Therefore, the performance indicators of the system are well met the requirements of the use of the equipment, providing reference value for the engineering implementation of the photoelectric tracking system.
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Key words:
- large zoom ratio /
- wide band /
- continuous zoom optical system /
- cam curve /
- consistency of optical axis
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图 1 连续变焦光学系统正组补偿原理图
Fig. 1 the schematic of positive group compensation of continuous zoom optical system
图 6 变倍组与补偿组位移曲线
Fig. 6 Displacement curve of the zoom groups and the compensation groups
图 8 连续变焦系统的光轴一致性测试结果
Fig. 8 consistency of optical axis test results of the continuous zoom system
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