Physics – Optics
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992spie.1543...88d&link_type=abstract
In: Active and adaptive optical components; Proceedings of the Meeting, San Diego, CA, July 24-26, 1991 (A93-39559 15-74), p. 88
Physics
Optics
2
Actuators, Adaptive Optics, Drift (Instrumentation), Mirrors, Servomechanisms, Capacitors, Component Reliability, Fabrication, Systems Engineering
Scientific paper
The National Solar Observatory is constructing a continuous-face-plate mirror with 61 actuators. The mirror, which has a clear aperture of 218 mm, features a detachable face plate and replaceable actuators that are servoed to maintain a position measured by capacitors which are within the actuators themselves. The actuators are 20-mm diameter and are placed on 32-mm centers. Each has a range of 6.4 microns for a voltage swing of +/- 175 volts. The servos have a bandwidth of 1 KHz (-3 db). In order to couple the face plate to the actuators, each actuator has a rare-earth magnet on its end that attracts a steel button cemented to the 3-mm-thick glass faceplate. The mirror is a contender for those systems needing a relatively large adaptive mirror with relatively few actuators, for example, to replace the secondary mirror of a Cassegrain telescope. At Sacramento Peak the mirror will be used with the 76-cm aperture Vacuum Tower Telescope to observe small details on the sun.
Dunn Richard B.
Hull William
Streander George W.
Wilkins Larry
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