Physics
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984spie..444..228r&link_type=abstract
IN: Advanced technology optical telescopes II; Proceedings of the Meeting, London, England, September 5, 6, 1983 (A85-25230 10-8
Physics
Error Analysis, Mirrors, Optical Correction Procedure, Servocontrol, Surface Distortion, Telescopes, Active Control, Actuators, Control Systems Design, Finite Element Method, Flotation, Loads (Forces), Modal Response, Pressure Effects, Surface Stability
Scientific paper
Modal control analytical techniques and finite-element methods are applied to a thin flexible meniscus mirror. Several arrangements of piston actuators of an active system are shown to be near optimum relative to the disturbance inputs, such as thermal and wind loads of small area or randomly distributed. The related plots of modal coefficients, rms surface error, and the previous error analyses demonstrate the efficacy of the thin meniscus approach. The number of modes considered for typical errors is found to be less than 36, being within the current mechanical engineering technology. Many of the filtered disturbances exhibit primary astigmatic terms, requiring far fewer than 36 actuator points to control.
Chung T. Y.
Mani B. S.
Ray Frank B.
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