光学学报, 2013, 33 (10): 1022001, 网络出版: 2013-09-25   

畸变对TDI-CCD空间相机的影响分析及抑制方法研究

Influence of Distortion on TDI-CCD Space Camera and Its Suppression Method
金光 1,2,*任秉文 1,2,3钟兴 1,2
作者单位
1 中国科学院长春光学精密机械与物理研究所, 吉林 长春 130033
2 小卫星技术国家地方联合工程研究中心, 吉林 长春 130033
3 中国科学院大学, 北京 100049
摘要
随着电荷耦合器件(CCD)的不断发展,时间延迟积分电荷耦合器件(TDI-CCD)已成为高分辨率、大F数、轻小型空间相机器件的首选。但受到光学系统畸变的影响,在TDI-CCD积分成像过程中,将不可避免地存在像移,并最终导致成像模糊,使图像调制传递函数(MTF)下降。分析了光学系统畸变引起像移的原因,并给出受畸变影响产生的MTF下降系数fMT,D关于光学系统畸变的表达式。从光学系统设计角度研究了限制fMT,D的方法,给出了光学系统设计结果。设计了焦距f′=9000 mm,F数为13.33,成像谱段为400~700 nm的偏视场同轴四反射低畸变、大视场光学系统。设计结果表明,在使用视场角2ω=2°范围内,波像差优于λ/21,受畸变影响产生的fMT,D为0.969,证明该系统很好地抑制了光学系统畸变对积分成像的影响。研究可为高分辨率、宽视场、大F数的轻小型空间相机的设计提供参考。
Abstract
With the continuous development of the charge coupled device (CCD), the time delay integration charge coupled device (TDI-CCD) has become the first choice for high-resolution, large F number, compact space camera. However, due to the distortion of the optical system, in the process of TDI-CCD integral imaging, the image motion is inevitable, and eventually leads to the blurred image, and then image modulation transfer function (MTF) decreases. This paper analyzes the reason of the image motion caused by optical system distortion, and gives the expression of the MTF declined coefficient fMT,D by the distortion effects. From the point of view of optical system design, the method of restricting fMT,D is researched, and the results of the optical system design are given. Low distortion, wide field coaxial bias field fourth reflective optical system, with the focal length f′=9000 mm, F number of 13.33, and imaging spectral range of 400~700 nm, is designed. The design results demonstrate that the wavefront error is better than λ/21 and the fMT,D generated by the distortion is 0.969 in the using field angle 2ω=2°. It is proved that the system well suppresses the impact of distortion on integral imaging optical system. This study could provide the reference for high-resolution, wide field, large F number, and compact space camera design.

金光, 任秉文, 钟兴. 畸变对TDI-CCD空间相机的影响分析及抑制方法研究[J]. 光学学报, 2013, 33(10): 1022001. Jin Guang, Ren Bingwen, Zhong Xing. Influence of Distortion on TDI-CCD Space Camera and Its Suppression Method[J]. Acta Optica Sinica, 2013, 33(10): 1022001.

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