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1 July 1990 Chopping secondary mirror system for 1.3-m IR telescope
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In order to achieve a high speed/high precision/low power consumption IR telescope chopping system which excites no mechanical resonances, in conjunction with a device size smaller than the secondary mirror diameter, a chopping servo has been developed which uses feedforward control with optimized driving torque as well as feedback control guided by robust stability theory. The compactness of the device has been achieved through the use of an Nd-Fe-B magnet motor and the balancing of the mirror against the mass of the electromechanical system. The chopper has a 10-msec transient time, and stability in excess of 1 arcsec, for square-wave chopping with amplitudes of as much as 300 arcsec.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Takaharu Ueda, Shigeki Mizuno, and Tetsu Yamamoto "Chopping secondary mirror system for 1.3-m IR telescope", Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990);

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