Co-phasing of segmented mirror telescopes with curvature sensing

Valeri G. Orlov; Salvador Cuevas; Fernando Garfias; Valeri V. Voitsekhovich; Leonardo J. Sanchez

doi:10.1117/12.393930

2 August 2000 Co-phasing of segmented mirror telescopes with curvature sensing

Valeri G. Orlov, Salvador Cuevas, Fernando Garfias, Valeri V. Voitsekhovich, Leonardo J. Sanchez

Proceedings Volume 4004, Telescope Structures, Enclosures, Controls, Assembly/Integration/Validation, and Commissioning; (2000) https://doi.org/10.1117/12.393930
Event: Astronomical Telescopes and Instrumentation, 2000, Munich, Germany

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.

Citation Download Citation

Valeri G. Orlov, Salvador Cuevas, Fernando Garfias, Valeri V. Voitsekhovich, and Leonardo J. Sanchez "Co-phasing of segmented mirror telescopes with curvature sensing", Proc. SPIE 4004, Telescope Structures, Enclosures, Controls, Assembly/Integration/Validation, and Commissioning, (2 August 2000); https://doi.org/10.1117/12.393930

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