Active Control of Edges and Global Microstructure on Segmented Mirrors

D. D. Walker, A. Beaucamp, C. Dunn, R. Evans, R. Freeman, R. Morton, S. Wei, G. Yu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

19 Citations (Scopus)


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.

Original languageEnglish
Title of host publicationAdvanced Optical and Mechanical Technologies in Telescopes and Instrumentation
EditorsEli Atad-Ettedgui, Dietrich Lemke
Number of pages9
Volume7018, Part 1
ISBN (Print)9780819472281
Publication statusPublished - 23 Jul 2008
Externally publishedYes
EventSPIE Astronomical Telescopes and Instrumentation - Marseille, France
Duration: 23 Jun 200828 Jun 2008

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceSPIE Astronomical Telescopes and Instrumentation


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