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Proceedings Paper

Chopping secondary mirror system for 1.3-m IR telescope
Author(s): Takaharu Ueda; Shigeki Mizuno; Tetsu Yamamoto
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Paper Abstract

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.

Paper Details

Date Published: 1 July 1990
PDF: 8 pages
Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); doi: 10.1117/12.19206
Show Author Affiliations
Takaharu Ueda, Mitsubishi Electric Corp. (Japan)
Shigeki Mizuno, Mitsubishi Electric Corp. (Japan)
Tetsu Yamamoto, Mitsubishi Electric Corp. (Japan)

Published in SPIE Proceedings Vol. 1236:
Advanced Technology Optical Telescopes IV
Lawrence D. Barr, Editor(s)

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