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Proceedings Paper

Demonstration of a segment alignment maintenance system on a seven-segment subarray of the Hobby-Eberly Telescope
Author(s): John M. Rakoczy; Drew Hall; Richard T. Howard; John T. Weir; Edward E. Montgomery; Gregory H. Ames; Tim Danielson; Phil Zercher
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Paper Abstract

NASA's Marshall Space Flight Center, in collaboration with Blue Line Engineering of Colorado Springs, Colorado, is developing a Segment Alignment Maintenance System (SAMS) for McDonald Observatory's Hobby-Eberly Telescope (HET). The SAMS shall sense motions of the 91 primary mirror segments and send corrections to HET's primary mirror controller as the mirror segments misalign due to thermo-elastic deformations of the mirror support structure. The SAMS consists of inductive edge sensors. All measurements are sent to the SAMS computer where mirror motion corrections are calculated. In October 2000, a prototype SAMS was installed on a seven-segment cluster of the HET. Subsequent testing has shown that the SAMS concept and architecture are a viable practical approach to maintaining HET's primary mirror figure, or the figure of any large segmented telescope. This paper gives a functional description of the SAMS sub-array components and presents test data to characterize the performance of the sub-array SAMS.

Paper Details

Date Published: 4 February 2002
PDF: 12 pages
Proc. SPIE 4494, Adaptive Optics Systems and Technology II, (4 February 2002); doi: 10.1117/12.454780
Show Author Affiliations
John M. Rakoczy, NASA Marshall Space Flight Ctr. (United States)
Drew Hall, NASA Marshall Space Flight Ctr. (United States)
Richard T. Howard, NASA Marshall Space Flight Ctr. (United States)
John T. Weir, NASA Marshall Space Flight Ctr. (United States)
Edward E. Montgomery, NASA Marshall Space Flight Ctr. (United States)
Gregory H. Ames, Blue Line Engineering Co. (United States)
Tim Danielson, Blue Line Engineering Co. (United States)
Phil Zercher, Blue Line Engineering Co. (United States)


Published in SPIE Proceedings Vol. 4494:
Adaptive Optics Systems and Technology II
Robert K. Tyson; Domenico Bonaccini; Michael C. Roggemann, Editor(s)

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