Sensitivity improvements for Shack-Hartmann wavefront sensors using total variation minimization

Basden, A.G.; Morris, T.J.; Gratadour, D.; Gendron, E.

Abstract

We investigate the improvements in Shack–Hartmann wavefront sensor image processing that can be realized using total variation minimization techniques to remove noise from these images. We perform Monte Carlo simulation to demonstrate that at certain signal-to-noise levels, sensitivity improvements of up to one astronomical magnitude can be realized. We also present on-sky measurements taken with the CANARY adaptive optics system that demonstrate an improvement in performance when this technique is employed, and show that this algorithm can be implemented in a real-time control system. We conclude that total variation minimization can lead to improvements in sensitivity of up to one astronomical magnitude when used with adaptive optics systems.

Citation

Basden, A., Morris, T., Gratadour, D., & Gendron, E. (2015). Sensitivity improvements for Shack-Hartmann wavefront sensors using total variation minimization. Monthly Notices of the Royal Astronomical Society, 449(4), 3537-3542. https://doi.org/10.1093/mnras/stv617

• Journal Article Type: Article
• Acceptance Date: Mar 18, 2015
• Online Publication Date: Apr 9, 2015
• Publication Date: Jun 1, 2015
• Deposit Date: Jun 26, 2015
• Publicly Available Date: Jun 29, 2015
• 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: 449
• Issue: 4
• Pages: 3537-3542
• DOI: https://doi.org/10.1093/mnras/stv617
• Keywords: Instrumentation: adaptive optics, Instrumentation: detectors, Methods: numerical, Methods: statistical.
• Public URL: https://durham-repository.worktribe.com/output/1405701