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Real-time correlation reference update for astronomical adaptive optics.

Basden, A. G. and Chemla, F. and Dipper, N. and Gendron, E. and Henry, D. and Morris, T. and Rousset, G. and Vidal, F. (2014) 'Real-time correlation reference update for astronomical adaptive optics.', Monthly notices of the Royal Astronomical Society., 439 (1). pp. 968-976.

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.

Item Type:Article
Keywords:Instrumentation: adaptive optics, Instrumentation: high angular resolution, Techniques: image processing.
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1093/mnras/stu027
Publisher 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.
Record Created:23 Oct 2014 14:05
Last Modified:14 Nov 2014 10:20

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