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Figuring high aspheric mirrors by elastic deformation method.

机译:通过弹性变形法计算高非球面镜。

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摘要

Aspheric surfaces play an important role in optical systems (4), but the application of such surfaces is constrained due to difficulties of fabrication.;In this thesis, the feasibility of figuring aspheric surfaces is investigated using the elastic deformation techniques. Specifically, the primary mirror of the proposed Space Debris Telescope is researched. This mirror consists of a concave hyperboloid with a fast focal ratio of f/0.66 and has a conic constant of k = ;In this thesis we present a general method for production of aspheric mirrors by elastic deformation. To do this a general function describing the deflection and orientation of aspheric surfaces is presented. This function can be used for most aspheres including a sphere. By means of the elastic plate theory, the load distributions can be found to produce the desired deformation.;Different finite element models are constructed to estimate the stresses in the mirror when the deflection is prescribed. The problem of determining an adequate number of discrete points for applying the forces and a best-fitting sphere for an aspheric surface are investigated. Stresses in the mirror are determined and checked to see that the chosen material has sufficient strength.
机译:非球面在光学系统中起着重要的作用(4),但是由于制造困难,这种表面的应用受到了限制。;本文采用弹性变形技术研究了非球面的可行性。具体来说,研究了拟议中的空间碎片望远镜的主镜。该镜由凹面双曲面组成,其快速聚焦比为f / 0.66,圆锥常数为k =。在本文中,我们提出了一种通过弹性变形生产非球面镜的通用方法。为此,提出了描述非球面的挠度和方向的通用功能。此功能可用于包括球在内的大多数非球面。借助弹性板理论,可以发现载荷分布以产生所需的变形。;建立了不同的有限元模型,以在规定了挠度时估算镜中的应力。研究了确定足够数量的离散点以施加力和非球面的最合适球体的问题。确定并检查镜中的应力,以确保所选材料具有足够的强度。

著录项

  • 作者

    Kang, Yan.;

  • 作者单位

    University of Victoria (Canada).;

  • 授予单位 University of Victoria (Canada).;
  • 学科 Engineering Mechanical.;Physics Astronomy and Astrophysics.
  • 学位 M.A.Sc.
  • 年度 1990
  • 页码 97 p.
  • 总页数 97
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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