Douglas J Laidlaw
Optimizing the accuracy and efficiency of optical turbulence profiling using adaptive optics telemetry for extremely large telescopes
Laidlaw, Douglas J; Osborn, James; Morris, Timothy J; Basden, Alastair G; Beltramo-Martin, Olivier; Butterley, Timothy; Gendron, Eric; Reeves, Andrew P; Rousset, Gerard; Townson, Matthew J; Wilson, Richard W
Authors
Professor James Osborn james.osborn@durham.ac.uk
Professor
Professor Timothy Morris t.j.morris@durham.ac.uk
Professor
Dr Alastair Basden a.g.basden@durham.ac.uk
Hpc Technical Manager
Olivier Beltramo-Martin
Timothy Butterley timothy.butterley@durham.ac.uk
Post Doctoral Research Associate
Eric Gendron
Andrew P Reeves
Gerard Rousset
Matthew Townson matthew.townson@durham.ac.uk
PGR Student Doctor of Philosophy
Dr Richard Wilson r.w.wilson@durham.ac.uk
Associate Professor
Abstract
Advanced adaptive optics (AO) instruments on ground-based telescopes require accurate knowledge of the atmospheric turbulence strength as a function of altitude. This information assists point spread function reconstruction, AO temporal control techniques and is required by wide-field AO systems to optimize the reconstruction of an observed wavefront. The variability of the atmosphere makes it important to have a measure of the optical turbulence profile in real time. This measurement can be performed by fitting an analytically generated covariance matrix to the cross-covariance of Shack–Hartmann wavefront sensor (SHWFS) centroids. In this study we explore the benefits of reducing cross-covariance data points to a covariance map region of interest (ROI). A technique for using the covariance map ROI to measure and compensate for SHWFS misalignments is also introduced. We compare the accuracy of covariance matrix and map ROI optical turbulence profiling using both simulated and on-sky data from CANARY, an AO demonstrator on the 4.2 m William Herschel telescope, La Palma. On-sky CANARY results are compared to contemporaneous profiles from Stereo-SCIDAR – a dedicated high-resolution optical turbulence profiler. It is shown that the covariance map ROI optimizes the accuracy of AO telemetry optical turbulence profiling. In addition, we show that the covariance map ROI reduces the fitting time for an extremely large telescope-scale system by a factor of 72. The software package we developed to collect all of the presented results is now open source.
Citation
Laidlaw, D. J., Osborn, J., Morris, T. J., Basden, A. G., Beltramo-Martin, O., Butterley, T., …Wilson, R. W. (2018). Optimizing the accuracy and efficiency of optical turbulence profiling using adaptive optics telemetry for extremely large telescopes. Monthly Notices of the Royal Astronomical Society, 483(4), 4341-4353. https://doi.org/10.1093/mnras/sty3285
Journal Article Type | Article |
---|---|
Acceptance Date | Nov 27, 2018 |
Online Publication Date | Dec 3, 2018 |
Publication Date | Dec 3, 2018 |
Deposit Date | Jan 17, 2019 |
Publicly Available Date | Jan 24, 2019 |
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 | 483 |
Issue | 4 |
Pages | 4341-4353 |
DOI | https://doi.org/10.1093/mnras/sty3285 |
Public URL | https://durham-repository.worktribe.com/output/1339545 |
Files
Published Journal Article
(2.4 Mb)
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Copyright Statement
© 2018 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
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