W. M. Keck telescope segmented primary mirror active control system software

Richard W. Cohen; S. Andreae; A. K. Biocca; Richard C. Jared; Jorge Llacer; John D. Meng; Robert H. Minor; M. Orayani

doi:10.1117/12.19268

1 July 1990 W. M. Keck telescope segmented primary mirror active control system software

Richard W. Cohen, S. Andreae, A. K. Biocca, Richard C. Jared, Jorge Llacer, John D. Meng, Robert H. Minor, M. Orayani

Proceedings Volume 1236, Advanced Technology Optical Telescopes IV; (1990) https://doi.org/10.1117/12.19268
Event: SPIE Astronomical Telescopes and Instrumentation for the 21st Century, 1990, Tucson, AZ, United States

Abstract

The active control system (ACS) uses both parallel and distributed processing techniques to measure and control the posi- Lions of the 36 segments of the Keck Observatory Telescope primary mirror. The main function of the software is to mainthin the mirror figure; to accomplish this goal the software uses a predictive, "feed-forward" mechanism which effectively increases the system bandwidth for the most important sources of perturbation. The software executes on a set of twelve 68000-family processors under the supervision of a VAX workstation. An array of nine parallel I/O processors collect and process data from 168 displacement sensors and transmit motion commands to 108 actuators. Three additional processors simultaneously compute actuator commands, monitor system performance, compute sensor control parameters and communicate with other observatory computers. The software is highly optimized for speed.

Citation Download Citation

Richard W. Cohen, S. Andreae, A. K. Biocca, Richard C. Jared, Jorge Llacer, John D. Meng, Robert H. Minor, and M. Orayani "W. M. Keck telescope segmented primary mirror active control system software", Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); https://doi.org/10.1117/12.19268

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