Image quality and seeing measurements for long horizontal overwater propagation
| Autor: | Hubert Beaumont, Claude Aime, Henri Lanteri, Eric Aristidi |
|---|---|
| Přispěvatelé: | MEDIAN Technologies, Joseph Louis LAGRANGE (LAGRANGE), Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 1997 |
| Předmět: |
Scintillation
Daytime Fried parameter Image quality business.industry Astrophysics::Instrumentation and Methods for Astrophysics General Engineering General Physics and Astronomy Ranging 01 natural sciences law.invention 010309 optics Telescope Optics law Distortion 0103 physical sciences [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] business 010303 astronomy & astrophysics ComputingMilieux_MISCELLANEOUS Geology Visible spectrum |
| Zdroj: | Pure and Applied Optics Journal of the European Optical Society Part A Pure and Applied Optics Journal of the European Optical Society Part A, Institute of Physics (IOP), 1997, 6 (1), pp.15-30. ⟨10.1088/0963-9659/6/1/004⟩ |
| ISSN: | 1361-6617 0963-9659 |
| DOI: | 10.1088/0963-9659/6/1/004 |
| Popis: | The effect of atmospheric turbulence on the imaging of scenes, for horizontal propagation of the light over a distance of 20 km, 15 m above the sea surface, was analysed at visible wavelengths using a 20 cm telescope. Point-source images were recorded during the night, and the Fried parameter was derived using several methods, leading to values ranging from 2 to 4 cm depending on observing conditions. A very high level of scintillation was observed. Studies of correlations between close-by sources lead to a very small domain of isoplanatism. Daytime observations of an extended source are also performed; an image motion of small spatial coherent length seems to be drawn by a horizontal wind producing a wave-like distortion of horizontal lines and a boiling-like distortion of vertical ones. |
| Databáze: | OpenAIRE |
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