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Edges in CNC polishing: from mirror-segments towards semiconductors, paper 1: edges on processing the global surface

Walker, D.D., Yu, G., Li, H., Messelink, W., Evans, R. and Beaucamp, A. (2012) Edges in CNC polishing: from mirror-segments towards semiconductors, paper 1: edges on processing the global surface. Optics Express, 20 (18). pp. 19787-19798. ISSN 1094-4087

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Abstract

Segment-edges for extremely large telescopes are critical for
observations requiring high contrast and SNR, e.g. detecting exo-planets. In
parallel, industrial requirements for edge-control are emerging in several
applications. This paper reports on a new approach, where edges are
controlled throughout polishing of the entire surface of a part, which has
been pre-machined to its final external dimensions. The method deploys
compliant bonnets delivering influence functions of variable diameter,
complemented by small pitch tools sized to accommodate aspheric mis-fit.
We describe results on witness hexagons in preparation for full size
prototype segments for the European Extremely Large Telescope, and
comment on wider applications of the technology.

Item Type: Article
Subjects: T Technology > TS Manufactures
Schools: School of Computing and Engineering
School of Computing and Engineering > Centre for Precision Technologies
Related URLs:
Depositing User: Catherine Parker
Date Deposited: 29 Nov 2016 16:03
Last Modified: 29 Nov 2016 16:03
URI: http://eprints.hud.ac.uk/id/eprint/30400

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