抛光
计量学
光学
望远镜
超大望远镜
天球
曲率半径
干涉测量
半径
物理
计算机科学
遥感
工程类
曲率
天文
地质学
机械工程
数学
几何学
银河系
平均曲率
流量平均曲率
计算机安全
作者
Dijana Bogunović,Graeme Jonas,Dave Cochrane,S. Sriram,G. C. Anupama
出处
期刊:Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV
日期:2020-12-10
卷期号:: 151-151
被引量:1
摘要
The Thirty Meter Telescope (TMT) is a joint venture of scientific institutions in Canada, China, India, Japan and the United States to build a 30 m diameter Ritchey-Chretien optical-infrared telescope. The large aperture size and field of view, with its adaptive optics (AO) systems will enable imaging at the diffraction limit, precision astrometry, high contrast imaging and spectroscopy from the ultraviolet through the mid-infrared. Its 30 m primary mirror consists of 492 off-axis aspheric segmented hexagonal mirrors, each having a diameter of 1.44 m across corners. The manufacture of the segments is distributed amongst India, USA, China and Japan. KiwiStar Optics (business unit of Callaghan Innovation), New Zealand manufactured a reference sphere for India TMT Co-Ordination Centre (ITCC). This paper presents polishing, testing procedures and metrology challenges of a 61.7 m long radius of curvature reference sphere. The radius of curvature and surface figure interferometric testing error budget is discussed in detail.
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