Muslimov Eduard, Valls-Gabaud David, Lemaître Gérard, Hugot Emmanuel, Jahn Wilfred, Lombardo Simona, Wang Xin, Vola Pascal, Ferrari Marc
Appl Opt. 2017 Nov 1;56(31):8639-8647. doi: 10.1364/AO.56.008639.
We present the design of an all-reflective, bifolded Schmidt telescope aimed at surveys of extended astronomical objects with extremely low surface brightness. The design leads to a high image quality without any diffracting spider, a large aperture and field of view (FoV), and a small central obstruction that barely alters the point spread function (PSF). As an example, we design a high-quality, 36 cm diameter, fast (f/2.5) telescope working in the visible with a large FoV (1.6°×2.6°). The telescope can operate with a curved detector (or with a flat detector with a field flattener) and a set of filters. The entrance mirror is anamorphic and replaces the classical Schmidt entrance corrector plate. We show that this anamorphic primary mirror can be manufactured through stress polishing, avoiding high spatial frequency errors, and testing with a simple interferometer scheme. This prototype is intended to serve as a fast-track scientific and technological pathfinder for the future space-based MESSIER mission.
我们展示了一种全反射双折施密特望远镜的设计，该望远镜旨在对具有极低表面亮度的扩展天体进行巡天观测。这种设计能实现高图像质量，且无需任何衍射副镜，具有大口径和视场（FoV），以及极小的中心遮挡，几乎不改变点扩散函数（PSF）。例如，我们设计了一款高质量、直径36厘米、快速（f/2.5）的望远镜，工作在可见光波段，具有大视场（1.6°×2.6°）。该望远镜可与曲面探测器（或带场平器的平面探测器）及一组滤光片配合使用。入射镜是变形的，取代了传统的施密特入射校正板。我们表明，这种变形主镜可通过应力抛光制造，避免高空间频率误差，并能用简单的干涉仪方案进行测试。该原型旨在作为未来基于太空的梅西耶任务的快速科学技术探路者。
