Focal-plane Wavefront Sensing for Active Optics in the VST Based on an Analytical Optical Aberration Model

被引：4

作者：

Holzloehner, R. ^{[1
]}

Taubenberger, S. ^{[1
]}

Rakich, A. P. ^{[1
,2
]}

Noethe, L. ^{[1
]}

Schipani, P. ^{[3
]}

Kuijken, K. ^{[4
]}

机构：

[1] ESO, Karl Schwarzschild Str 2, D-85748 Garching, Germany

[2] GMTO Corp, Pasadena, CA 91107 USA

[3] INAF Osservatorio Astron Capodimonte, Salita Moiariello 16, I-80131 Naples, Italy

[4] Leiden Observ, Niels Bohrweg 2, NL-2333 CA Leiden, Netherlands

来源：

GROUND-BASED AND AIRBORNE TELESCOPES VI | 2016年 / 9906卷

关键词：

active optics; wide-field telescopes; point spread function; elongation; aberration; optical plate diagram;

D O I：

10.1117/12.2234398

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

We study a novel focal plane wavefront sensing and active optics control scheme at the VST on Cerro Paranal, an f/5.5 survey telescope with a 1 x 1 degree field of view and a 2.6m primary mirror. This scheme analyzes the elongation pattern of stellar PSFs across the full science image (256 Mpixels) and compares their second moments with an analytical model based on 5th-order geometrical optics. We consider 11 scalar degrees of freedom in mirror misalignments and deformations (M2 piston, tip/tilt and lateral displacement, detector tip/tilt, plus M1 figure astigmatism and trefoil). Using a numerical optimization method, we extract up to 4000 stars and complete the fitting process in under one minute. We demonstrate successful closed-loop active optics control based on maximum likelihood filtering.

引用

页数：11

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