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Proceedings Paper

An image motion compensation system for the multi-object double spectrograph
Author(s): J. L. Marshall; Thomas P. O'Brien; Bruce Atwood; Paul L. Byard; D. L. DePoy; Mark Derwent; Jason D. Eastman; Raymond Gonzalez; Daniel P. Pappalardo; Richard W. Pogge
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Paper Abstract

We discuss the performance of the Image Motion Compensation System (IMCS) for the Multi-Object Double Spectrograph (MODS). The system performs closed-loop image motion compensation, actively correcting for image motion in the spectrograph's focal plane caused by large scale structural bending due to gravity as well as other effects such as temperature fluctuation and mechanism flexure within the instrument. Not only does the system control instrumental flexure to within the specifications (0.1 pixels on the science CCD, or 1.5 μm), but it also has proven to be an excellent diagnostic tool for assembling and testing the spectrograph. We describe both the final performance of the system as deployed in the spectrograph as well as the instrumental tests made possible by the IMCS.

Paper Details

Date Published: 29 June 2006
PDF: 8 pages
Proc. SPIE 6269, Ground-based and Airborne Instrumentation for Astronomy, 62691J (29 June 2006); doi: 10.1117/12.669222
Show Author Affiliations
J. L. Marshall, The Ohio State Univ. (United States)
Thomas P. O'Brien, The Ohio State Univ. (United States)
Bruce Atwood, The Ohio State Univ. (United States)
Paul L. Byard, The Ohio State Univ. (United States)
D. L. DePoy, The Ohio State Univ. (United States)
Mark Derwent, The Ohio State Univ. (United States)
Jason D. Eastman, The Ohio State Univ. (United States)
Raymond Gonzalez, The Ohio State Univ. (United States)
Daniel P. Pappalardo, The Ohio State Univ. (United States)
Richard W. Pogge, The Ohio State Univ. (United States)


Published in SPIE Proceedings Vol. 6269:
Ground-based and Airborne Instrumentation for Astronomy
Ian S. McLean; Masanori Iye, Editor(s)

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