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Proceedings Paper

Design and operation of the infrared chopping secondary mirror for the Keck 10-m telescope
Author(s): Kenneth R. Lorell; Jean-Noel Aubrun; Gregory J. Feher; Ernesto O. Perez; Donald F. Zacharie; Paul J. Reshatoff
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Paper Abstract

In mid 1992 an actively controlled infrared (IR) reflecting secondary mirror was installed on the W.M. Keck Ten Meter Telescope, currently the world's largest telescope. This 0.5 m gold plated beryllium mirror is capable of extremely precise motions over a wide range of amplitude and frequency and is used to perform spatial chopping, a technique commonly used in IR astronomy to improve the signal-to-noise ratio of weak IR sources. This paper describes the design, implementation and test of the mirror drive and control system. Details of the drive electromechanical design and operations on its unique adaptive control system. Test data from laboratory and telescope operation are also shown and discussed, and a short video of the mirror system in operation (shown at the conference) is also briefly described.

Paper Details

Date Published: 31 May 1994
PDF: 12 pages
Proc. SPIE 2201, Adaptive Optics in Astronomy, (31 May 1994); doi: 10.1117/12.176117
Show Author Affiliations
Kenneth R. Lorell, Lockheed Palo Alto Research Lab. (United States)
Jean-Noel Aubrun, Lockheed Palo Alto Research Lab. (United States)
Gregory J. Feher, Lockheed Palo Alto Research Lab. (United States)
Ernesto O. Perez, Lockheed Palo Alto Research Lab. (United States)
Donald F. Zacharie, Lockheed Palo Alto Research Lab. (United States)
Paul J. Reshatoff, Lockheed Palo Alto Research Lab. (United States)


Published in SPIE Proceedings Vol. 2201:
Adaptive Optics in Astronomy
Mark A. Ealey; Fritz Merkle, Editor(s)

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