@inproceedings{622fa311435441ffa52c51630de7b250,
title = "Active Control of Edges and Global Microstructure on Segmented Mirrors",
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.",
keywords = "Edge, Microstructure, Polish, Random, Texture",
author = "Walker, {D. D.} and A. Beaucamp and C. Dunn and R. Evans and R. Freeman and R. Morton and S. Wei and G. Yu",
year = "2008",
month = jul,
day = "23",
doi = "10.1117/12.787930",
language = "English",
isbn = "9780819472281",
volume = "7018, Part 1",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Eli Atad-Ettedgui and Dietrich Lemke",
booktitle = "Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation",
address = "United States",
note = "SPIE Astronomical Telescopes and Instrumentation ; Conference date: 23-06-2008 Through 28-06-2008",
}