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The W. M. Keck Telescope segmented primary mirror active control system [electronic resource].

Published
Washington, D.C : United States. Dept. of Energy. Office of Energy Research, 1989.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: (13 pages) : digital, PDF file
Additional Creators
Lawrence Berkeley National Laboratory, United States. Department of Energy. Office of Energy Research, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The ten meter diameter primary mirror of the W. M. Keck Telescope is a mosaic of thirty-six hexagonal mirrors. An active control system stabilizes the primary mirror. The active control system uses 168 measurements of the relative positions of adjacent mirror segments and 3 measurements of the primary mirror position in the telescope structure to control the 108 degrees of freedom needed to stabilize the figure and position of the primary mirror. The components of the active control system are relative position sensors, electronics, computers, actuators that position the mirrors, and software. The software algorithms control the primary mirror, perform star image stacking, emulate the segments, store and fit calibration data, and locate hardware defects. We give an overview of the active control system, its functional requirements and test measurements. 12 refs.
Report Numbers
E 1.99:lbl-27586
E 1.99: conf-900285--7
conf-900285--7
lbl-27586
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
07/01/1989.
"lbl-27586"
" conf-900285--7"
"DE91004249"
SPIE astronomical telescopes and instrumentation for the 21st century symposium, Tucson, AZ (USA), 11-17 Feb 1990.
Nelson, J.; Cohen, R.W.; Franck, J.; Schaefer, B.; Gabor, G.; Arthur, A.A.; Jared, R.C.; Llacer, J.; Salz, P.; Mast, T.; Meng, J.; Fuertes, J.M.; Merrick, T.; Biocca, A.; Minor, R.; Witebsky, C.; Andreae, S.; Orayani, M.
STOFCA
Funding Information
AC03-76SF00098
View MARC record | catkey: 14674722