TMA空间相机性能稳定性的全状态分析与测试

Analysis and testing on imaging-performance stability of TMA space camera at various states

光学系统波像差是空间相机的关键成像性能指标，其稳定性决定了成像质量的稳定性。针对大视场TMA空间相机研制过程和在轨成像时重力和温度变化状态，用有限元方法分析反射镜位置公差、面形等尺寸稳定性，结合反射镜的加工面形，计算光学系统波像差，分析成像性能稳定性的变化；采用实验室多方向重力（水平、悬挂、向上、向下等）和20±4°环境调温状态模拟测试，系统波像差平均在λ/14.7～λ/12.4之间，单个视场最低为λ/11。波像差的分析数据与测试结果趋势一致，各状态平均误差范围为-0.0126λ～0.0031λ，最大单点误差为-0.023λ；在不同状态下的传函复合测试结果都达0.21以上，相对变化小于-4.8%。该方法作为分析、验证系统成像稳定性有效便捷的手段，应用到大视场TMA空间相机的研制中，指导设计、分析薄弱环节，通过全状态的分析和测试，说明大视场TMA空间相机具有良好稳定的成像性能。

Stability of wavefront aberration （WFA） has great impacts on imaging quality of space camera, which is a major performance index for those. With regard to possible gravity orientation and temperature range of space camera in manufacture and orbit, the mirror′s tolerances and profile errors were calculated through FEA, and WFA was calculated by optical software using those. By simulating multi-orientation gravity states and adjusting environment temperature 20±4° in laboratory, WFA of the space camera was measured and tested, the average result changed from λ/14 . 7 to λ/12 . 4 at all states , the worst wasλ/11 for single field . The testing data was nearly in accord with the calculate value , the mean range were -0.012 6λ-0.003 1λ, the max difference error was -0.023λ. Moreover, the MTF to was tested validate the system stability, the result achieved 0.21, there were only 4.8% errors at choosing states. The method can be used to inspect and confirm the imaging performance stability, which has been used in wide-field TMA space camera, guiding design and finding week point, through analysis and testing, the data well illustrated the performance stability at all states.