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Proceedings Paper

W. M. Keck Telescope segmented primary mirror active control system
Author(s): Richard C. Jared; A. A. Arthur; S. Andreae; A. K. Biocca; Richard W. Cohen; Josep M. Fuertes; J. Franck; George Gabor; Jorge Llacer; Terry S. Mast; John D. Meng; Tom L. Merrick; Robert H. Minor; James Truman Nelson; M. Orayani; P. Salz; Barbara A. Schaefer; Chris Witebsky
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Paper Abstract

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.

Paper Details

Date Published: 1 July 1990
PDF: 13 pages
Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); doi: 10.1117/12.19266
Show Author Affiliations
Richard C. Jared, Lawrence Berkeley Lab. (United States)
A. A. Arthur, Lawrence Berkeley Lab. (United States)
S. Andreae, Lawrence Berkeley Lab. (United States)
A. K. Biocca, Lawrence Berkeley Lab. (United States)
Richard W. Cohen, Lawrence Berkeley Lab. (United States)
Josep M. Fuertes, Lawrence Berkeley Lab. (Spain)
J. Franck, Lawrence Berkeley Lab. (United States)
George Gabor, Lawrence Berkeley Lab. (United States)
Jorge Llacer, Lawrence Berkeley Lab. (United States)
Terry S. Mast, Lawrence Berkeley Lab. (United States)
John D. Meng, Lawrence Berkeley Lab. (United States)
Tom L. Merrick, Lawrence Berkeley Lab. (United States)
Robert H. Minor, Lawrence Berkeley Lab. (United States)
James Truman Nelson, Lawrence Berkeley Lab. (United States)
M. Orayani, Lawrence Berkeley Lab. (United States)
P. Salz, Lawrence Berkeley Lab. (United States)
Barbara A. Schaefer, Lawrence Berkeley Lab. (United States)
Chris Witebsky, Lawrence Berkeley Lab. (United States)


Published in SPIE Proceedings Vol. 1236:
Advanced Technology Optical Telescopes IV
Lawrence D. Barr, Editor(s)

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