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Proceedings Paper

Development of the segment alignment maintenance system (SAMS) for the Hobby-Eberly Telescope
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Paper Abstract

A sensing and control system for maintaining optical alignment of ninety-one 1-meter mirror segments forming the Hobby-Eberly Telescope (HET) primary mirror array is now under development. The Segment Alignment Maintenance System (SAMS) is designed to sense relative shear motion between each segment edge pair and calculated individual segment tip, tilt, and piston position errors. Error information is sent to the HET primary mirror control system, which corrects the physical position of each segment as often as once per minute. Development of SAMS is required to meet optical images quality specifications for the telescope. Segment misalignment over time is though to be due to thermal inhomogeneity within the steel mirror support truss. Challenging problems of sensor resolution, dynamic range, mechanical mounting, calibration, stability, robust algorithm development, and system integration must be overcome to achieve a successful operational solution.

Paper Details

Date Published: 20 July 2000
PDF: 12 pages
Proc. SPIE 4003, Optical Design, Materials, Fabrication, and Maintenance, (20 July 2000); doi: 10.1117/12.391509
Show Author Affiliations
John A. Booth, McDonald Observatory/Univ. of Texas at Austin (United States)
Mark T. Adams, McDonald Observatory/Univ. of Texas at Austin (United States)
Gregory H. Ames, Blue Line Engineering Co. (United States)
James R. Fowler, McDonald Observatory/Univ. of Texas at Austin (United States)
Edward E. Montgomery, NASA Marshall Space Flight Ctr. (United States)
John M. Rakoczy, NASA Marshall Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 4003:
Optical Design, Materials, Fabrication, and Maintenance
Philippe Dierickx, Editor(s)

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