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Proceedings Paper

Closed-Loop Active Optics: Its Advantages And Limitations For Correction Of Wind-Buffet Deformations Of Large Flexible Mirrors
Author(s): R. N. Wilson; L. Noethe
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Paper Abstract

Wind buffet deformation of large flexible mirrors is, from its frequency bandpass and other characteristics, an overlap area between normal low bandpass "Active Optics" and high bandpass "Adaptive Optics". The fundamental problem posed is that the time frequencies involved do not permit the elimination of external seeing effects by appropriate time integrations with the image analyser, as in normal low bandpass closed-loop operation. Confusion between the wind deformation and atmospheric functions results. For wind buffet correction in these circumstances, we analyse the possibilities and limitations of the closed-loop principle using one or more image analysers in a number of configurations. Some important parameters of the atmospheric function apear to be insufficiently known and should be measured experimentally if rapid practical progress is to be made. Cross-checks betweens closed-loop and open-loop methods in a two-pronged approach seem highly desirable.

Paper Details

Date Published: 20 September 1989
PDF: 12 pages
Proc. SPIE 1114, Active Telescope Systems, (20 September 1989); doi: 10.1117/12.960834
Show Author Affiliations
R. N. Wilson, ESO (Germany)
L. Noethe, ESO (Germany)

Published in SPIE Proceedings Vol. 1114:
Active Telescope Systems
Francois J. Roddier, Editor(s)

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