Auchère Frédéric, Rizzi Julien, Philippon Anne, Rochus Pierre
Institut d'Astrophysique Spatiale, CNRS/Université Paris-Sud 11, Bâtiment 121, 91405 Orsay, France.
J Opt Soc Am A Opt Image Sci Vis. 2011 Jan 1;28(1):40-5. doi: 10.1364/JOSAA.28.000040.
Thin metallic films are used as passband filters in space telescopes operating in the extreme ultraviolet (EUV). Because of their thinness, typically 100 to 200 nm, they are very sensitive to static pressure differentials and to mechanic and acoustic vibrations. Therefore, they are difficult to manage in all phases of a space program, from manufacturing to vacuum testing to launch. A common solution to this problem is to reinforce them with fine mesh grids with pitches ranging from a few hundred micrometers to a few millimeters. Depending on their location in the optical path, the main effect of these periodic grids is either to diffract light or to cast penumbral shadows on the focal plane. In this paper, we analyze the formation of the shadow modulation patterns and derive design rules to minimize their amplitude. The minimization principle is illustrated by an application to a solar EUV telescope.
薄金属膜被用作在极紫外（EUV）波段工作的太空望远镜中的通带滤波器。由于其厚度通常为100至200纳米，它们对静压差以及机械和声学振动非常敏感。因此，在太空计划的各个阶段，从制造到真空测试再到发射，对它们进行管理都很困难。解决这个问题的一个常见方法是用间距从几百微米到几毫米不等的细网格来加强它们。根据它们在光路中的位置，这些周期性网格的主要作用要么是使光发生衍射，要么是在焦平面上投射半影阴影。在本文中，我们分析了阴影调制图案的形成，并推导了使它们的幅度最小化的设计规则。通过将其应用于太阳EUV望远镜来说明最小化原理。
