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Primary Mirror Alignment and Assembly for a Spaceborne Cassegrain Telescope by Using CMM

机译：使用CMM的卡塞格伦星载望远镜的主镜对准和组装

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摘要

The currently developing spaceborne optical remote sensing payload is a typical Cassegrain telescope with 450 mm clear aperture. The primary mirror is made of ZERODUR glass ceramic blank and lightweighted with hexagonal cell structure at a ratio about 50% for considering both effect of thermal deformation and the mass budget of the rocket. For this mirror, it is critical to reduce the astigmatism caused from the gravity effect, bonding process and the deformation from the mounting to the main structure of the telescope (main plate). In this article, the alignment of primary mirror, MGSE for the alignment and assembly process and the optical performance test for the primary mirror assembly (PMA) are presented. To get the best optical performance of PMA, the bonding position of the bipod flexure relative to primary mirror is a critical issue and shall be analyzed by finite element method (FEM) before alignment and assembly process of PMA. The mechanical shim is the interface between the bipod flexure and main plate. It is used to adjust the bonding position for the bipod flexure relative to primary mirror and also compensate the manufacture tolerances of components and differences of local co-planarity errors to prevent the local stress while bipod flexure is screwed to main plate. After primary mirror assembly process, an optical performance test refer to "bench test" is used to analyze the astigmatism caused from the-gravity effect and the deformation from the mounting or supporter. In an effort to achieve the requirement for the tolerance in PMA, the astigmatism caused from the gravity and deformation by the mounting force can be controlled within P-V 0.02 λ at 632.8 nm. The consequence of these demonstrations indicates that the assembly technique for the lightweighted primary mirror meet the critical requirements for PMA of the telescope.
机译：目前正在开发的星载光学遥感有效载荷是具有450毫米净孔径的典型卡塞格林望远镜。主镜由ZERODUR玻璃陶瓷毛坯制成，并以六角形的蜂窝状结构轻量化，其比例约为50％，同时考虑了热变形的影响和火箭的质量预算。对于此反射镜，至关重要的是减少由重力效应，粘合过程以及从望远镜的安装件到主体（主板）的变形所引起的像散。在本文中，介绍了主镜的对准，用于对准和组装过程的MGSE以及主镜组件（PMA）的光学性能测试。为了获得PMA的最佳光学性能，两脚架挠曲相对于主镜的粘合位置是一个关键问题，必须在PMA对准和组装过程之前通过有限元方法（FEM）进行分析。机械垫片是两脚架弯曲件和主板之间的界面。它用于调整两脚架挠曲相对于主镜的结合位置，还可以补偿组件的制造公差和局部共面误差的差异，以防止在将两脚架挠曲拧到主板上时产生局部应力。在主镜组装过程之后，使用光学性能测试（称为“基准测试”）来分析由重力效应引起的像散以及由安装件或支撑件引起的变形。为了达到PMA公差的要求，可以将因安装力引起的重力和变形引起的像散控制在632.8 nm的P-V 0.02λ之内。这些演示的结果表明，轻量化主镜的组装技术满足了望远镜PMA的关键要求。

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