Matthew Townson matthew.townson@durham.ac.uk
PGR Student Doctor of Philosophy
Generating artificial reference images for open loop correlation wavefront sensors
Townson, M.J.; Love, G.D.; Saunter, C.D.
Authors
G.D. Love
C.D. Saunter
Abstract
Shack–Hartmann wavefront sensors for both solar and laser guide star adaptive optics (with elongated spots) need to observe extended objects. Correlation techniques have been successfully employed to measure the wavefront gradient in solar adaptive optics systems and have been proposed for laser guide star systems. In this paper, we describe a method for synthesizing reference images for correlation Shack–Hartmann wavefront sensors with a larger field of view than individual sub-apertures. We then show how these supersized reference images can increase the performance of correlation wavefront sensors in regimes where large relative shifts are induced between sub-apertures, such as those observed in open-loop wavefront sensors. The technique we describe requires no external knowledge outside of the wavefront-sensor images, making it available as an entirely ‘software’ upgrade to an existing adaptive optics system. For solar adaptive optics we show the supersized reference images extend the magnitude of shifts, which can be accurately measured from 12percent to 50percent of the field of view of a sub-aperture and in laser guide star wavefront sensors the magnitude of centroids that can be accurately measured is increased from 12percent to 25percent of the total field of view of the sub-aperture.
Citation
Townson, M., Love, G., & Saunter, C. (2018). Generating artificial reference images for open loop correlation wavefront sensors. Monthly Notices of the Royal Astronomical Society, 479(2), 1595-1602. https://doi.org/10.1093/mnras/sty1362
| Journal Article Type | Article |
|---|---|
| Acceptance Date | May 15, 2018 |
| Online Publication Date | May 25, 2018 |
| Publication Date | Sep 11, 2018 |
| Deposit Date | Jul 12, 2018 |
| Publicly Available Date | Jul 13, 2018 |
| 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 | 479 |
| Issue | 2 |
| Pages | 1595-1602 |
| DOI | https://doi.org/10.1093/mnras/sty1362 |
| Public URL | https://durham-repository.worktribe.com/output/1326054 |
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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.