Physics – Optics
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982spie..332..260m&link_type=abstract
IN: International Conference on Advanced Technology Optical Telescopes, Tucson, AZ, March 11-13, 1982, Proceedings (A83-30976 13
Physics
Optics
1
Adaptive Optics, Astronomical Photography, Atmospheric Effects, Image Enhancement, Mirrors, Piezoelectric Transducers, Angular Resolution, Electrostatic Probes, Image Resolution, Light Transmission, Real Time Operation, Wave Propagation
Scientific paper
An adaptive optics system with modal phase correction for reconstituting astronomical images passing through the atmosphere is described. An active mirror in a gimbal mount houses an electrostatic deformable membrane for the modal corrections. Piezoelectric actuators are attached behind the mirror for tilt correction. Wavefronts triggering the electrode detectors in the mirror also result in generation of a map of the wave-front errors. Compensating phase distributions for successive waves are calculated automatically by an expansion of the phase distortions into modes of a set of basis functions. Turbulence compensation is accomplished with Zernike polynomials if only a small number of modes is present, while Karhunen-Loeve functions serve for any number of modes. Phase aberrations are detected by diode arrays connected to amplifier tubes. Actual measurement of the wavefront phase is performed by a shearing interferometer and by use of an iterative algorithm to assay the intensity distribution of the image.
Freischlad Klaus
Merkle Fritz
Reischmann H.-L.
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