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Proceedings Paper

Displacement sensors for the primary mirror of the W. M. Keck telescope
Author(s): Robert H. Minor; A. A. Arthur; George Gabor; Hunter G. Jackson Jr.; Richard C. Jared; Terry S. Mast; Barbara A. Schaefer
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Paper Abstract

The Primary Mirror of the Keck Observatory Telescope is made up of an array of 36 hexagonal mirror segments under active control. The measurement of the relative orientations of the mirror segments is fundamental to their control. The mechanical and electronic design of the sensors used to measure these relative positions is described along with the performance of the sensors under a variety of tests. In use, the sensors will measure relative positions with a resolution of a few nanometers. This resolution and the low noise, drift and thermal sensitivity of the sensors are adequate to stabilize the primary mirror figure to the precision require for optical and infrared astronomy.

Paper Details

Date Published: 1 July 1990
PDF: 9 pages
Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); doi: 10.1117/12.19270
Show Author Affiliations
Robert H. Minor, Lawrence Berkeley Lab. (United States)
A. A. Arthur, Lawrence Berkeley Lab. (United States)
George Gabor, Lawrence Berkeley Lab. (United States)
Hunter G. Jackson Jr., Lawrence Berkeley Lab. (United States)
Richard C. Jared, Lawrence Berkeley Lab. (United States)
Terry S. Mast, Lawrence Berkeley Lab. (United States)
Barbara A. Schaefer, 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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