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Proceedings Paper

Active control of edges and global microstructure on segmented mirrors
Author(s): D. D. Walker; A. Beaucamp; C. Dunn; R. Evans; R. Freeman; R. Morton; S. Wei; G. Yu
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Paper Abstract

In this paper we address two interrelated issues important to primary mirror segments for extremely large telescopes - edge-control, and the detailed topography over the segment surface. Both affect the intensity and distribution of stray light and infrared emissivity. CNC polishing processes typically deploy spiral or raster tool-paths, tending to leave repetitive features. We compare and contrast two novel families of pseudo-random tool-paths for Precessions CNC polishing. We then show how CNC control of the three-dimensional tool-path can optimize edge-profiles. Finally, we demonstrate fluid-jet polishing used to clean up residual edge defects.

Paper Details

Date Published: 23 July 2008
PDF: 9 pages
Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 701812 (23 July 2008); doi: 10.1117/12.787930
Show Author Affiliations
D. D. Walker, OpTIC Technium (United Kingdom)
Zeeko Ltd. (United Kingdom)
A. Beaucamp, Zeeko Ltd. (United Kingdom)
C. Dunn, Zeeko Technologies LLC (United States)
R. Evans, OpTIC Technium (United Kingdom)
R. Freeman, Zeeko Ltd. (United Kingdom)
R. Morton, Zeeko Ltd. (United Kingdom)
S. Wei, Zeeko Ltd. (United Kingdom)
G. Yu, OpTIC Technium (United Kingdom)

Published in SPIE Proceedings Vol. 7018:
Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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