Computer Science – Performance
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982spie..332..252h&link_type=abstract
IN: International Conference on Advanced Technology Optical Telescopes, Tucson, AZ, March 11-13, 1982, Proceedings (A83-30976 13
Computer Science
Performance
4
Active Control, Atmospheric Effects, Calibrating, Error Analysis, Telescopes, Wave Fronts, Feedback Control, Real Time Operation, Reference Stars, Signal To Noise Ratios, Time Lag
Scientific paper
The current capabilities of ground-based telescopes which feature active wavefront compensation effected through a small number of large active sections are assessed for viewing a star. Wavefront errors can arise from optical decentering or misalignment, segmented primary panel misalignment, mirror shape errors, internal turbulence, or local turbulence, as well as atmospheric distortions. Systematic errors such as misalignment, decentering, or defocus are rectified by feedback to a secondary mirror, while random wavefront errors are counteracted using feedback to individual primary mirror actuators. The active control systems experience wavefront fitting, photon noise, time delay, and anisoplanatic errors. Wavefront fitting, photon noise, time delay, and anisoplanatic errors. Wavefront fitting errors limit the performance of any active compensation system, and a peak SNR ratio can be determined for the photon noise errors. Time delay errors can be minimized by using optimized integration intervals. Finally, large telescopes can be calibrated using reference stars to make corrections for all error sources.
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