The W. M. Keck Telescope segmented primary mirror active control system software

Conference · Sat Jul 01 00:00:00 EDT 1989

OSTI ID:6525204

Cohen, R W ^[1]; Andreae, S; Biocca, A K; Jared, R C; Llacer, J; Meng, J D; Minor, R H; Orayani, M ^[2]

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1. Lawrence Berkeley Lab., CA (USA) California Association for Research in Astronomy, Kamuela, HI (USA)
2. Lawrence Berkeley Lab., CA (USA)

The active control system (ACS) uses both parallel and distributed processing techniques to measure and control the positions of the 36 segments of the Keck Observatory Telescope primary mirror. The main function of the software is to maintain 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. 6 refs., 7 figs.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• Sponsoring Organization: CAARA; DOE/ER
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6525204
• Report Number(s): LBL-27588; CONF-900285-8; ON: DE91004287
• Resource Relation: Conference: SPIE astronomical telescopes and instrumentation for the 21st century symposium, Tucson, AZ (USA), 11-17 Feb 1990
• Country of Publication: United States
• Language: English

Related Subjects

47 OTHER INSTRUMENTATION
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
COMPUTERIZED CONTROL SYSTEMS
DESIGN
TELESCOPES
ACTUATORS
ARRAY PROCESSORS
CALIBRATION
COMPUTER ARCHITECTURE
COORDINATES
DEC COMPUTERS
MIRRORS
PARALLEL PROCESSING
COMPUTERS
CONTROL SYSTEMS
PROGRAMMING
440600* - Optical Instrumentation- (1990-)
990200 - Mathematics & Computers