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首页> 外文会议>Conference on Survey and Other Telescope Technologies and Discoveries; Aug 27-28, 2002; Waikoloa, Hawaii, USA >Large Synoptic Survey Telescope Mechanical Structure and Design
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Large Synoptic Survey Telescope Mechanical Structure and Design

机译：大型天气望远镜的机械结构与设计。

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摘要

The Large-aperture Synoptic Survey Telescope, LSST, will have an effective aperture of ～6.5 m and a 3 degree field of view. Its 3-mirror optical system with 8.4 m primary, 3.5 m secondary, 4.2 meter tertiary mirrors and a trapped focus offer unique telescope design challenges. The operation of this telescope will require quick slewing, accurate tracking and alignment maintained actively for 0.25 arcsec images in the presence of wind and gravity perturbations. We describe our current design for which finite element models show a lowest frequency resonance above 7 Hertz. Further refinement promises an even stiffer structure. The design has been optimized for low mass (230 tons), minimal inertia (2.4x10~6 kg-m~2 in elevation, 3.2x10~6 kg-m~2 in azimuth) for fast response. It takes advantage of several concepts proven in the Large Binocular Telescope mount, which has shown high performance at low cost. These include elevation motion on C rings placed under the primary mirror, a primary mirror cell built as an integral part of the structure, and the elevation axis placed behind and off to the side of the primary vertex, to achieve balance with minimum mass.
机译：大口径天气测量望远镜LSST的有效孔径约为6.5 m，视野范围为3度。它的三反射镜光学系统具有8.4 m的主镜，3.5 m的副镜，4.2米的三重镜和陷焦镜，这对望远镜设计提出了独特的挑战。在存在风和重力扰动的情况下，此望远镜的操作需要对0.25 arcsec图像进行快速回转，准确跟踪和对齐，并保持主动状态。我们描述了当前的设计，其中有限元模型显示出最低的7 Hz以上的频率谐振。进一步的改进将使结构更加坚固。该设计针对低质量（230吨），最小惯性（仰角2.4x10〜6 kg-m〜2，方位角3.2x10〜6 kg-m〜2）进行了优化，以实现快速响应。它利用了在大型双筒望远镜安装座中证明的几个概念，这些安装座已经以低成本展示了高性能。其中包括放置在主镜下方的C环上的仰角运动，作为该结构的组成部分构建的主镜单元以及放置在主顶点侧面后方或侧面的仰角轴，以实现最小质量的平衡。

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