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21 January 1993 High-performance chopping secondary mirror for infrared astronomy
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The paper describes the electromechanical design of the drive system for the actively controlled chopping secondary mirror of the W.M. Keck Ten Meter Telescope, which performs two-axis spatial chopping. Also described are the reaction cancellation system, the special packaging and cooling features, and the operation of the adaptive drive system. Laboratory test data are presented showing the performance of the drive and control system for chop amplitudes up to 54 arcmin (mirror motion), duty cycles of up to 98 percent, and frequencies from 1 to 50 Hz.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kenneth R. Lorell, Jean-Noel Aubrun, Gregory J. Feher, Ernesto O. Perez, Donald F. Zacharie, and Paul J. Reshatoff Jr. "High-performance chopping secondary mirror for infrared astronomy", Proc. SPIE 1765, Cryogenic Optical Systems and Instruments V, (21 January 1993);

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