Comparison of computer postprocessing and low-order adaptive optics

Details Comparison of computer postprocessing and low-order adaptive optics Comparison of computer postprocessing and low-order adaptive optics

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993spie.2029..275l&link_type=abstract

Proc. SPIE Vol. 2029, p. 275-286, Digital Image Recovery and Synthesis II, Paul S. Idell; Ed.

Physics

Optics

Scientific paper

Using simulation we investigate the difference in performance between low order adaptive optics and computer post-processing techniques. It is shown that even a simple tip-tilt defocus correction implemented with a rigid mirror can improve the quality of speckle images and thus improve the bispectral reconstructions at low photon rates. As an alternative to this low cost adaptive optics system we consider the use of ensemble deconvolution where a Shack- Hartmann sensor is used to augment the speckle images. Results are presented to show that this is a viable alternative to adaptive optics when a simple system for compensating atmospheric turbulence is desired. In particular we investigate the optimal size of Shack- Hartmann array when there is significant CCD readout noise.

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