高分辨率超低畸变航天光学成像系统设计

在航天空间交会、对接等高精度定位应用中需要光学成像系统具有高分辨率、低畸变、大视场的特点，为此设计了一种满足上述要求的航天物镜。采用复杂化的双高斯结构形式进行准像方远心光路设计，系统由9片透镜组成，并采用耐辐射玻璃材料减少离子辐射的腐蚀性；采用滤光片避免短波辐射对系统的影响，引入非球面提高成像精度，最后对成像物镜进行了公差分析。设计的系统焦距为24 mm，相对孔径为F/2.2，工作波段600 nm~800 nm，全视场角为35°。设计结果表明，采用该方法设计的物镜在128 lp/mm处各视场传递函数值均大于0.3，畸变值为0.007 2%，达到设计指标要求。

Abstract

In space rendezvous, docking and other high-precision positioning applications, optical imaging system is required to have the characteristics of high resolution, ultra-low distortion and large field of view. Therefore, an aerospace objective which could meet the above requirements was designed. The complex double-Gaussian structure was used to design the quasi image space telecentric optical path. The system consisted of 9 lenses and used the radiation-resistant glass to reduce the corrosiveness of ionizing radiation.Moreover the filter was used to avoid the influence of short-wave radiation on the system, the aspheric surface was introduced to improve the imaging accuracy, and finally the tolerance analysis of the imaging objective was carried out. The focal length of the designed system is 24 mm, the relative aperture is F/2.2, the work waveband is 600 nm~800 nm, the full field of view(FOV) is 35°. The design results show that the modulation transfer funciton (MTF) of each FOV of the objective lens designed by this method is all above 0.3 at 128 lp/mm and the distortion value is 0.007 2%,which meets the design index requirements.

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