Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989spie.1114..258m&link_type=abstract
IN: Active telescope systems; Proceedings of the Meeting, Orlando, FL, Mar. 28-31, 1989 (A90-30852 12-74). Bellingham, WA, Socie
Astronomy and Astrophysics
Astronomy
Active Control, Actuators, Astronomical Observatories, Mirrors, Reflecting Telescopes, Shape Control, Controllers, Displacement Measurement, Electronic Control, Pointing Control Systems, Systems Engineering, Temperature Measurement
Scientific paper
The Keck Observatory primary mirror is comprised of 36 segments from which 216 glass temperatures and 168 measures of relative displacement are continuously read. Mirror figure adjustments are under the active control of 108 adjustable-length actuators, three per segment. The collection method for mirror segment displacement data and glass temperature data, and the supplying of individual control signals to the actuator controllers and sensor electronics (both located near each mirror segment) are described, and the mirror's computerized control system is discussed. Much of the sense and control electronics is close to the near surface of the primary mirror. A historical perspective is given on the impact of the need to minimize heat sources and cabling, on the communications method used and on its implementation. A brief structural overview is given of the hardware used to actively maintain primary mirror figure.
Meng John D.
Merrick T.
Minor Robert
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