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Proceedings Paper

Adaptive Optical System For Astronomical Applications
Author(s): F. Merkle; J. Bille; G. Jahn; H . -L . .Reischmann
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Paper Abstract

Light propagation through the atmosphere is disturbed by atmospheric turbulence. This limits the high angular resolution, in astronomical imaging. Active optics is a method to overcome this problem. It allows a real-time optimization of the resolving power. An active mirror was developed which consists of an electrostatically deformable membrane. For an atmospheric tilt compensation of the wave-front the mirror housing is in a gimbal mount with piezo-electric actuators. With this active mirror device and a multi-microprocessor control unit the stabilisation of the star-speckle pattern positions and the deconvolution of the speckle patterns are possible. The compensating phase distribution is generated by an expansion of the turbulence phase distortions into modes of a set of basis functions, i.e. Zernike-polnomials or Karhunen-Loeve-func-tions. By applying a modal control concept to the adaptive optical system, the electrodes of a mem-brane mirror are controlled in parallel with com-pensated cross-talk. The coefficients of the ap-proximating functions, each of which corresponds to a mode on the mirror surface, are fed back to the actuators by a modal control matrix.

Paper Details

Date Published: 15 April 1983
PDF: 6 pages
Proc. SPIE 0422, 10th Intl Optical Computing Conf, (15 April 1983); doi: 10.1117/12.936150
Show Author Affiliations
F. Merkle, University of Heidelberg (F.R. Germany)
J. Bille, University of Heidelberg (F.R. Germany)
G. Jahn, University of Heidelberg (F.R. Germany)
H . -L . .Reischmann, University of Heidelberg (F.R. Germany)

Published in SPIE Proceedings Vol. 0422:
10th Intl Optical Computing Conf
Sam Horvitz, Editor(s)

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