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7 March 2003 An Image Motion Compensation System for the Multi-Object Double Spectrograph
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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.
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Jennifer L. Marshall, Bruce Atwood, Paul Laurence Byard, Darren L. DePoy, Thomas P. O'Brien, and Richard W. Pogge "An Image Motion Compensation System for the Multi-Object Double Spectrograph", Proc. SPIE 4841, Instrument Design and Performance for Optical/Infrared Ground-based Telescopes, (7 March 2003);

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