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Proceedings Paper

An image motion compensation system for the multi-object double spectrograph
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Paper Abstract

We describe a closed-loop image motion compensation system (IMCS) for the Multi-Object Double Spectrograph (MODS). The IMCS compensates for structural bending due to gravity and eliminates image motion from temperature fluctuation and mechanism flexure within the instrument during an observing period. The system makes use of an infrared laser source at the telescope focal plane, which produces reference spots in the science detector plane. Movement of these spots accurately tracks science image motion, since the two beams share a common optical path. Small real-time adjustments to the position of the MODS collimator mirror compensate for the image motions.

Paper Details

Date Published: 7 March 2003
PDF: 7 pages
Proc. SPIE 4841, Instrument Design and Performance for Optical/Infrared Ground-based Telescopes, (7 March 2003); doi: 10.1117/12.459935
Show Author Affiliations
Jennifer L. Marshall, The Ohio State Univ. (United States)
Bruce Atwood, The Ohio State Univ. (United States)
Paul Laurence Byard, The Ohio State Univ. (United States)
Darren L. DePoy, The Ohio State Univ. (United States)
Thomas P. O'Brien, The Ohio State Univ. (United States)
Richard W. Pogge, The Ohio State Univ. (United States)


Published in SPIE Proceedings Vol. 4841:
Instrument Design and Performance for Optical/Infrared Ground-based Telescopes
Masanori Iye; Alan F. M. Moorwood, Editor(s)

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