Extension of the matched-filter algorithm to multiple guide star Shack–Hartmann wavefront sensor
| Autor: | Piotr Piatrou |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Pixel
business.industry Computer science Matched filter Image processing Wavefront sensor Laser 01 natural sciences Atomic and Molecular Physics and Optics law.invention 010309 optics Optics Giant Magellan Telescope law 0103 physical sciences Guide star Electrical and Electronic Engineering business Focus (optics) Adaptive optics Engineering (miscellaneous) Shack–Hartmann wavefront sensor Algorithm |
| Zdroj: | Applied Optics. 58:841 |
| ISSN: | 2155-3165 1559-128X |
| DOI: | 10.1364/ao.58.000841 |
| Popis: | The adaptive optics (AO) systems with multiple laser guide stars (LGSs) may significantly benefit in terms of hardware simplification from merging several LGS optical channels into one with a single wavefront sensor. As Shack-Hartmann sensors typically suffer from incomplete filling of the camera area, there exists an opportunity to overlay several Hartmann spot patterns densely within a compact composite one, resulting in very frugal use of the camera pixels. We show that such a pattern with only slight spot overlap can be composed even in the quite extreme case of the Giant Magellan Telescope laser tomography AO system employing six highly elongated side-launched laser beacons. The problem of disentangling the overlapped spots is efficiently solvable by a generalization of the matched-filter (MF) algorithm, which is the main focus of this work. Dynamic calibration by star dithering in the case of extended MF is still possible, albeit more complicated. Computational complexity increase and performance degradation in comparison to classical MF can be minimized to acceptable values by careful system parameter tuning. |
| Databáze: | OpenAIRE |
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