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9 January 1984 An Active Mirror Image Stabilizing Instrument System (ISIS) For Use On Mauna Kea
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On nights when the seeing is at its best on Mauna Kea, the cores of images produced by the large optical telescopes (UH 2.24-m and CFHT 3.6-m) shrink to sizes < 0.5 arcsec. During these periods, the image cores show translational motion over a patch < 1 arcsec at frequencies < 30 Hz. To remove this translation motion, an Image Stabilizing Instrument System (ISIS) has been built and used on Mauna Kea. The instrument contains a microprocessor-controlled active plane mirror capable of being repositioned every 2 ms, a photon-counting guide probe, and an active shutter to remove moments of excessive image blur. We describe the instrument's design detail, discuss the optimal way to use such an instrument, and show samples of observational data taken with it.
© (1984) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Laird A Thompson and Herbert R Ryerson "An Active Mirror Image Stabilizing Instrument System (ISIS) For Use On Mauna Kea", Proc. SPIE 0445, Instrumentation in Astronomy V, (9 January 1984);


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