Adaptive Optical System For Astronomical Applications

F. Merkle; J. Bille; G. Jahn; H . -L . .Reischmann

doi:10.1117/12.936150

15 April 1983 Adaptive Optical System For Astronomical Applications

F. Merkle, J. Bille, G. Jahn, H . -L . .Reischmann

Proceedings Volume 0422, 10th Intl Optical Computing Conf; (1983) https://doi.org/10.1117/12.936150
Event: 10th International Optical Computing Conference, 1983, Cambridge, United States

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.

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F. Merkle, J. Bille, G. Jahn, and H . -L . .Reischmann "Adaptive Optical System For Astronomical Applications", Proc. SPIE 0422, 10th Intl Optical Computing Conf, (15 April 1983); https://doi.org/10.1117/12.936150

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KEYWORDS

Actuators

Control systems

Mirrors

Disk lasers

Sensors

Wavefronts

Atmospheric optics

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