Analysis and mitigation of pupil discontinuities on adaptive optics performance
Analysis and mitigation of pupil discontinuities on adaptive optics performance
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自适应光学性能中光瞳不连续性的分析和缓解
DOI:
10.1117/12.2313129
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发表时间:
2018
期刊:
影响因子:
--
通讯作者:
Clarke F
中科院分区:
文献类型:
--
作者:
Clarke F
As already noticed in other telescopes, the presence of large telescope spiders and of a segmented deformable mirror in an Adaptive Optics system leads to pupil fragmentation and may create phase discontinuities. On the ELT telescope, a typical effect is the differential piston, where all disconnected areas of the pupil create their own piston, unseen locally but drastically degrading the final image quality. The poor sensitivity of the Pyramid WFS to differential piston will lead to these modes been badly seen and therefore badly controlled by the adaptive optics (AO) loop. In close loop operation, differential pistons between segments will start to appear and settle around integer values of the average sensing wavelength. These additional differential pistons are artificially injected by the adaptive optics control loop but do not have any real physical origin, contrary to the Low Wind Effect. In an attempt to reduce the impact of unwanted differential pistons that are injected by the AO loop, we propose a novel approach based on the pair-wise coupling of the actuators sitting on the edges of the deformable mirror segments. In this paper, we present the correction principle, its performance in nominal seeing condition, and its robustness relative to changing seeing conditions, wind speed and natural guide star magnitude. We show that the edge actuator coupling is a simple and robust solution and that the additional quadratic error relative to the reference case (i.e. no spiders) is of only 40 nm RMS, well within the requirements for HARMONI.
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DOI:
--
发表时间:
2016
期刊:
Astronomical Telescopes + Instrumentation
影响因子:
--
作者:
N. Thatte;F. Clarke;I. Bryson;Hermine Shnetler;M. Tecza;T. Fusco;R. Bacon;J. Richard;E. Mediavilla;B. Neichel;S. Arribas;B. García;C. Evans;A. Remillieux;Kacem El Madi;J. Herreros;D. Melotte;K. O’Brien;I. Tosh;J. Vernet;P. Hammersley;D. Ives;G. Finger;R. Houghton;D. Rigopoulou;J. Lynn;Jamie R. Allen;S. Zieleniewski;S. Kendrew;Vanessa Ferraro;A. Pécontal;J. Kosmalski;F. Laurent;M. Loupias;L. Piquéras;E. Renault;J. Blaizot;E. Daguisé;J. Migniau;A. Jarno;Andrew J. Born;A. Gallie;D. Montgomery;D. Henry;N. Schwartz;W. Taylor;G. Zins;L. Rodríguez;M. Cágigas;G. Battaglia;R. Rebolo López;E. Hernández Suárez;José Vincente Gigante;Javier Piqueras López;Montserrat Villa Martin;C. Correia;S. Pascal;L. Blanco;P. Vola;B. Épinat;C. Péroux;A. Vigan;K. Dohlen;J. Sauvage;Martin Lee;A. Carlotti;C. Vérinaud;T. Morris;R. Myers;A. Reeves;M. Swinbank;A. Calcines;M. Larrieu
通讯作者:
M. Larrieu
DOI:
10.1117/12.2231291
发表时间:
2016
期刊:
Journal of Astronomical Telescopes, Instruments, and Systems
影响因子:
--
作者:
N. Schwartz;J. Sauvage;C. Correia;B. Neichel;L. Blanco;T. Fusco;A. Pécontal;A. Jarno;L. Piquéras;K. Dohlen;K. El Hadi;N. Thatte;I. Bryson;F. Clarke;H. Schnetler
通讯作者:
H. Schnetler
DOI:
--
发表时间:
2016
期刊:
Astronomical Telescopes + Instrumentation
影响因子:
--
作者:
F. Quirós;R. Conan;A. Bouchez;B. McLeod
通讯作者:
B. McLeod
DOI:
10.26698/ao4elt5.0015
发表时间:
2018
期刊:
arXiv: Instrumentation and Methods for Astrophysics
影响因子:
--
作者:
N. Schwartz;J. Sauvage;C. Correia;C. Petit;F. Quirós;T. Fusco;K. Dohlen;K. E. Hadi;N. Thatte;F. Clarke;J. Paufique;J. Vernet
通讯作者:
J. Vernet
DOI:
--
发表时间:
2018
期刊:
Adaptive Optics Systems VI
影响因子:
--
作者:
J. Sauvage;B. Neichel;T. Fusco;C. Correia;K. Dohlen;L. Blanco;K. E. Hadi;N. Thatte
通讯作者:
N. Thatte