Analysis of inner geometric noise influence on image quality of large aperture segmented adaptive telescopes

Yurij Petrovich Shumilov; Peter Alexseevich Bakut; Olga M. Ershova

doi:10.1117/12.454402

29 January 2002 Analysis of inner geometric noise influence on image quality of large-aperture segmented adaptive telescopes

Yurij Petrovich Shumilov, Peter Alexseevich Bakut, Olga M. Ershova

Author Affiliations +

Proceedings Volume 4538, Optics in Atmospheric Propagation and Adaptive Systems IV; (2002) https://doi.org/10.1117/12.454402
Event: International Symposium on Remote Sensing, 2001, Toulouse, France

Abstract

Distortions, induced by angular and longitudinal errors of telescope segments aligning, are analyzed. Two mechanisms of images averaging are modeled and analytically investigated. Temperature and other slow fluctuations of telescope mirror segments geometric parameters cause one of them. Correlation time of that process is of the order of several hours. That mechanism is investigated in reference 1. Correlation time of the other process is determined by receiving device material time constant. In the second case the certain amount of mirror segments is necessary for the averaging. If the first case, in principle, compensation is possible, the distortions can't be compensated in the second one. It leads to existing in the image some constant component, called 'inner geometric noise' (IGN). We obtained illustrating dependencies and evaluation of the IGN influence on telescope vision range.

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Yurij Petrovich Shumilov, Peter Alexseevich Bakut, and Olga M. Ershova "Analysis of inner geometric noise influence on image quality of large-aperture segmented adaptive telescopes", Proc. SPIE 4538, Optics in Atmospheric Propagation and Adaptive Systems IV, (29 January 2002); https://doi.org/10.1117/12.454402

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