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

doi:10.1117/12.787930

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 proceeding › Conference contribution

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.

Original language	English
Title of host publication	Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation
DOIs	https://doi.org/10.1117/12.787930
Publication status	Published - 2008
Externally published	Yes
Event	Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation - Marseille, France Duration: 2008 Jun 23 → 2008 Jun 28

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	7018
ISSN (Print)	0277-786X

Conference

Conference	Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation
Country/Territory	France
City	Marseille
Period	08/6/23 → 08/6/28

Keywords

Edge
Microstructure
Polish
Random
Texture

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

Access to Document

10.1117/12.787930

Cite this

Walker, D. D., Beaucamp, A., Dunn, C., Evans, R., Freeman, R., Morton, R., Wei, S., & Yu, G. (2008). Active control of edges and global microstructure on segmented mirrors. In Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation [701812] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7018). https://doi.org/10.1117/12.787930

Active control of edges and global microstructure on segmented mirrors. / Walker, D. D.; Beaucamp, A.; Dunn, C. et al.
Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation. 2008. 701812 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7018).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Walker, DD, Beaucamp, A, Dunn, C, Evans, R, Freeman, R, Morton, R, Wei, S & Yu, G 2008, Active control of edges and global microstructure on segmented mirrors. in Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation., 701812, Proceedings of SPIE - The International Society for Optical Engineering, vol. 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, Marseille, France, 08/6/23. https://doi.org/10.1117/12.787930

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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",

doi = "10.1117/12.787930",

language = "English",

isbn = "9780819472281",

series = "Proceedings of SPIE - The International Society for Optical Engineering",

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T1 - Active control of edges and global microstructure on segmented mirrors

AU - Walker, D. D.

AU - Beaucamp, A.

AU - Dunn, C.

AU - Evans, R.

AU - Freeman, R.

AU - Morton, R.

AU - Wei, S.

AU - Yu, G.

PY - 2008

Y1 - 2008

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AB - 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.

KW - Edge

KW - Microstructure

KW - Polish

KW - Random

KW - Texture

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M3 - Conference contribution

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T3 - Proceedings of SPIE - The International Society for Optical Engineering

BT - Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation

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ER -

Active control of edges and global microstructure on segmented mirrors

Abstract

Publication series

Conference

Keywords

ASJC Scopus subject areas

Access to Document

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