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Proceedings Paper

Design and optimization of the Spherical Primary Optical Telescope (SPOT) primary mirror segment
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Paper Abstract

The 3m Spherical Primary Optical Telescope (SPOT) will utilize a single ring of 0.86 m point-to-point hexagonal mirror segments. The f2.85 spherical mirror blanks will be fabricated by the same replication process used for mass-produced commercial telescope mirrors. Diffraction-limited phasing will require segment-to-segment radius of curvature (ROC) variation of ~1 micron. Low-cost, replicated segment ROC variations could be almost 1 mm, necessitating a method for segment ROC adjustment & matching. A mechanical architecture has been designed that allows segment ROC to be adjusted up to 400 microns while introducing a minimum figure error, allowing segment-to-segment ROC matching. A key feature of the architecture is the unique back profile of the mirror segments. The back profile of the mirror was developed with shape optimization in MSC.Nastran™ using optical performance response equations written with SigFit. A candidate back profile was generated which minimized ROC-adjustment-induced surface error while meeting the constraints imposed by the fabrication method.

Paper Details

Date Published: 9 September 2005
PDF: 6 pages
Proc. SPIE 5877, Optomechanics 2005, 587711 (9 September 2005); doi: 10.1117/12.626566
Show Author Affiliations
Jason G. Budinoff, NASA GSFC (United States)
Gregory J. Michels, Sigmadyne, Inc. (United States)


Published in SPIE Proceedings Vol. 5877:
Optomechanics 2005
Alson E. Hatheway, Editor(s)

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