| 共轴TMA反射镜面形不规则影响研究 |
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| 引用本文： | 钟兴,金光,王栋,阎勇.共轴TMA反射镜面形不规则影响研究[J].光学精密工程,2008,16(8):1516-1521. |
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| 作者姓名： | 钟兴 金光 王栋 阎勇 |
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| 作者单位： | 长春光机所 |
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| 基金项目： | 国家863高技术研究发展计划资助项目(No.2007AA12Z113) |
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| 摘 要： | 共轴TMA（三反射镜消像散系统）是轻型高分辨空间相机常用的光学系统形式。共轴TMA反射镜一般采用非球面，其面形的不规则主要由环境变化和加工精度造成。面形的环境耐受与具体的结构设计有关，加工的精度又牵涉到周期和成本，因此，在共轴TMA设计中，需要对各种因素综合分析以保证实现光学系统的设计分辨能力，同时不造成浪费。以某遮拦比为22.3％的共轴三反系统的Φ600mm主镜为例，分析了主镜、次镜和三镜面形不规则对高斯焦点波前差的影响，并拟合了数学表达式。使用环域修正Zernike多项式作为光机接口，分析了环境对反射镜面形的影响以及传递函数下降的情况，并将分析结果做为参考对主镜支撑进行了改进。根据像差容限和系统的环境耐受力，分解出主镜加工所需的精度应优于λ/36.5.
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| 关 键 词： | 共轴TMA Zernike多项式 面形不规则 波前差 |
| 收稿时间： | 2008-06-02 |
| 修稿时间： | 2008-06-04 |
Research on Surface Irregularity Influence of On-axis TMA Mirror |
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| ZHONG Xing.Research on Surface Irregularity Influence of On-axis TMA Mirror[J].Optics and Precision Engineering,2008,16(8):1516-1521. |
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| Authors: | ZHONG Xing |
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| Abstract: | By taking an actual on-axis Three Mirror Anastigmatic(TMA) system with a Φ600 mm primary mirror for example,the influences of the surface irregularities of primary mirror,secondary mirror and tertiary mirror on Gaussian focus wave-front error were analyzed,and the mathematic expressions of the influences were fitted.Circle field fixed Zernike polynomial was used as an optic-mechanic interface to analyze the environment influence on primary mirror and system performance degeneration.Finally,by taking the result as reference,the supporting structure of primary mirror was improved.Based on the Marechal criterion and environment endurance,the manufacturing accuracy of primary mirror is deduced,which shows that it should be higher than λ/36.5. |
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| Keywords: | on-axis TMA Zernike polynomial surface accuracy wave-front error |
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