Real-time correlation reference update for astronomical adaptive optics

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....

Full description

Saved in:
Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2014-03, Vol.439 (1), p.968-976
Main Authors: Basden, Alastair G., Chemla, Fanny, Dipper, Nigel, Gendron, Eric, Henry, David, Morris, Tim, Rousset, Gerrard, Vidal, Fabrice
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics
Correlation analysis
Gravity
Optics
Physics
Citations: Items that this one cites
Items that cite this one
Online Access:Request full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stu027