光学学报, 2013, 33 (7): 0722002, 网络出版: 2013-07-01
宽幅离轴三反光学系统研究
Research of Broad Width off-Axis Three Mirror Optical System
成像系统 离轴三反 自由曲面 调制传递函数 imaging system off-axis three-mirror freeform surface modulation transfer function
摘要
通过对离轴三反光学系统结构特点和像差特性的研究,在光学系统适当的位置引入了自由曲面,设计了焦距为1000 mm,F数为7,视场为20°×10°的宽幅离轴三反光学系统。该系统在空间频率为50 lp/mm处的调制传递函数值均大于0.49。与以往采用推扫成像的模式相比,该系统实现了画幅成像模式,使得探测器的选择更加广泛。该系统与其他三反射光学系统相比,主要优点是可以获得更宽的成像视场,可提升遥感器的成像质量。
Abstract
Through the study on the structural features and aberration characteristics of the off-axis three mirror optical system, a freeform surface is used in the appropriate location of the system. A broad width off-axis three mirror optical system is designed, with focal length of 1000 mm, F-number of 7, field of view of 20°×10°. The modulation transfer function of this optical system is higher than 0.49 at spatial frequency of 50 lp/mm. Compared with the previous pushbroom imaging model, this optical system realizes frame imaging model, so the choice of detector is more extensive. Compared with other three mirror optical systems, the main advantage of this broad width off-axis three mirror optical system is that it can obtain a wider imaging field of view, enhancing the quality of remote sensor imaging.
林晶, 崔庆丰, 朱浩. 宽幅离轴三反光学系统研究[J]. 光学学报, 2013, 33(7): 0722002. Lin Jing, Cui Qingfeng, Zhu Hao. Research of Broad Width off-Axis Three Mirror Optical System[J]. Acta Optica Sinica, 2013, 33(7): 0722002.