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Proceedings Paper

DIPSI: measure of the tip-tilt with a diffraction image phase sensing instrument
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Paper Abstract

Large segmented mirrors require efficient co-phasing techniques in order to avoid the image degradation due to segments misalignment. DIPSI (Diffraction Image Phase Sensing Instrument) is an instrument developed by IAC, GRANTECAN and LAM. This instrument is being integrated in the Active Phasing Experiment (APE), aimed at testing different phasing techniques for an Extremely Large Telescope. This paper describes the mathematical solution for determining piston and tip-tilt simultaneously from the DIPSI images. A complete set of simulations is included to study the residual errors. Residual errors are bigger when piston and tip-tilt are combined (three degrees of freedom).

Paper Details

Date Published: 10 July 2008
PDF: 11 pages
Proc. SPIE 7012, Ground-based and Airborne Telescopes II, 701213 (10 July 2008); doi: 10.1117/12.787818
Show Author Affiliations
Sergio Chueca, Instituto de Astrofísica de Canarias (Spain)
Marcos Reyes, Instituto de Astrofísica de Canarias (Spain)
Achim Schumacher, GTC (Spain)
Luzma Montoya, Instituto de Astrofísica de Canarias (Spain)

Published in SPIE Proceedings Vol. 7012:
Ground-based and Airborne Telescopes II
Larry M. Stepp; Roberto Gilmozzi, Editor(s)

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