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Proceedings Paper

Co-phasing of segmented mirror telescopes with curvature sensing
Author(s): Valeri G. Orlov; Salvador Cuevas; Fernando Garfias; Valeri V. Voitsekhovich; Leonardo J. Sanchez
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Paper Abstract

The applicability of the curvature method for co-phasing of segmented mirrors is investigated by means of simulations for the case of strongly defocused images. The simulations are performed for both the monochromatic and the white light as well. A simple wavefront reconstruction from curvature signal was made. The reconstruction quality of the piston modes and the aberrations up to the fourth order is analyzed. The dependence of the Central Intensity Ratio for a segmented mirror as a function of the rms segment's aberrations is presented. The effect of turbulence-induced distortions on the quality of mirror co-phasing is analyzed. It is shown that the local pistons and the local tip-tilts can be measured directly from the curvature signal without any phase recovering procedure. The results obtained show that, even in the presence of the atmospheric turbulence, the curvature method is sensitive enough to detect the errors of segmented mirrors.

Paper Details

Date Published: 2 August 2000
PDF: 12 pages
Proc. SPIE 4004, Telescope Structures, Enclosures, Controls, Assembly/Integration/Validation, and Commissioning, (2 August 2000); doi: 10.1117/12.393930
Show Author Affiliations
Valeri G. Orlov, Instituto de Astronomia/Univ. Nacional Autonoma de Mexico (Mexico)
Salvador Cuevas, Instituto de Astronomia/Univ. Nacional Autonoma de Mexico (Mexico)
Fernando Garfias, Instituto de Astronomia/Univ. Nacional Autonoma de Mexico (Mexico)
Valeri V. Voitsekhovich, Instituto de Astronomia/Univ. Nacional Autonoma de Mexico (Mexico)
Leonardo J. Sanchez, Instituto de Astronomia/Univ. Nacional Autonoma de Mexico (Mexico)


Published in SPIE Proceedings Vol. 4004:
Telescope Structures, Enclosures, Controls, Assembly/Integration/Validation, and Commissioning
Thomas A. Sebring; Torben Andersen, Editor(s)

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