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Real-time correlation reference update for astronomical adaptive optics

Basden, A.G.; Chemla, F.; Dipper, N.; Gendron, E.; Henry, D.; Morris, T.; Rousset, G.; Vidal, F.

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Authors

F. Chemla

N. Dipper

E. Gendron

D. Henry

T. Morris

G. Rousset

F. Vidal



Abstract

The use of laser guide stars in astronomical adaptive optics results in elongated Shack–Hartmann wavefront sensor image patterns. Image correlation techniques can be used to determine local wavefront slope by correlating each sub-aperture image with its expected elongated shape, or reference image. Here, we present a technique which allows the correlation reference images to be updated while the adaptive optics loop is closed. We show that this can be done without affecting the resulting point spread functions. On-sky demonstration is reported. We compare different techniques for obtaining the reference images, and investigate performance over a wide range of adaptive optics system parameters. We find that image correlation techniques perform better than the standard centre-of-gravity algorithm and are highly suited for use with open-loop multiple object adaptive optics systems.

Citation

Basden, A., Chemla, F., Dipper, N., Gendron, E., Henry, D., Morris, T., …Vidal, F. (2014). Real-time correlation reference update for astronomical adaptive optics. Monthly Notices of the Royal Astronomical Society, 439(1), 968-976. https://doi.org/10.1093/mnras/stu027

Journal Article Type Article
Acceptance Date Jan 4, 2014
Online Publication Date Jan 31, 2014
Publication Date Mar 21, 2014
Deposit Date Oct 22, 2014
Publicly Available Date Mar 28, 2024
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 439
Issue 1
Pages 968-976
DOI https://doi.org/10.1093/mnras/stu027
Keywords Instrumentation: adaptive optics, Instrumentation: high angular resolution, Techniques: image processing.

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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2014 The Author Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.





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