月基望远镜杂散光PST研究与测试

发布时间：2018-11-17 13:45

【摘要】：针对月基望远镜(LOT)杂散光抑制能力的验证,在地面采用点源透过率法对其遮光罩视场外杂散光抑制比进行了测试,并利用光学系统视场外不同离轴角的点源透过率(PST)来评价其杂散光抑制比。该PST测试方法突破了以往的杂散光测试方法,采用高精度星模拟器与EMCCD结合的思路,保证了探测器在其线性区域内具有大动态范围探测能力的特性,其动态探测范围可达1012,可满足指标PST(在22°离轴角)测试值10-7的要求。该方法能更客观、更直接地反应遮光罩的杂散光抑制能力,其PST(在22°离轴角)测试不确定度可优于60%,远远高于以往杂散光抑制比的测试精度。另外,讨论了该测试方法需改进的几点措施,PST测试预期目标可达10-12。最后通过试验对LOT相机遮光罩的杂散光抑制比进行测试,验证了LOT相机杂散光抑制比满足设计要求。
[Abstract]:Based on the verification of the (LOT) stray light suppression ability of the moon based telescope, the off-field stray light suppression ratio of its mask was measured by point source transmittance method on the ground. The stray light suppression ratio (SRR) is evaluated by point source transmittance (PST) at different off-axis angles of the optical system. This PST test method breaks through the previous stray light measurement method and adopts the idea of combining high precision satellite simulator with EMCCD to ensure the detector has the characteristics of large dynamic range detection ability in its linear region, and its dynamic detection range can reach 1012. The test value of PST (22 掳off axis angle) can be satisfied with the requirement of 10-7. This method can more objectively and directly reflect the stray light suppression ability of the mask. The uncertainty of PST (at 22 掳off-axis angle) can be better than 60%, which is much higher than that of the previous stray light suppression ratio. In addition, several measures needed to be improved in this test method are discussed. The expected target of PST test can reach 10-12. Finally, the spurious light suppression ratio of the LOT camera hood is tested, and it is verified that the spurious light suppression ratio of the LOT camera meets the design requirements.
【作者单位】：中国科学院西安光学精密机械研究所;中国科学院大学;
【基金】：探月工程二期项目
【分类号】：TH743

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