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Active Control of Edges and Global Microstructure on Segmented Mirrors

Walker, D.D., Beaucamp, A., Dunn, C., Evans, R., Freeman, R., Morton, R., Wei, X. and Yu, G. (2008) Active Control of Edges and Global Microstructure on Segmented Mirrors. SPIE - International Society for Optical Engineering. Proceedings. ISSN 0277-786X

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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.

Item Type: Article
Subjects: T Technology > TS Manufactures
Schools: School of Computing and Engineering
School of Computing and Engineering > Centre for Precision Technologies
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Depositing User: Catherine Parker
Date Deposited: 01 Dec 2016 11:45
Last Modified: 28 Aug 2021 12:11


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