Wavefront outer scale deduced from interferometric dispersed fringes
Résumé
In addition to site characterization, measurements of critical atmospheric parameters are required to design and to optimize future adaptive
optic systems and long-baseline interferometers. It is possible to estimate seeing conditions by processing data obtained with existing High
Angular Resolution instruments. We report the results of joint observations with the GI2T interferometer and the GSM site-testing monitor
performed over a period of several nights. We compared estimates of the wavefront outer scale done at various baselines as well as the seeing
(Fried’s parameter). We processed interferometric data by calculating power spectra of dispersed fringe images. Deduced measurements of the
optical path difference lead to the estimates of the outer scale. We found that the outer scale values obtained from the GI2T data are mostly in
the 5−30 m range, in good agreement with GSM measurements.
Domaines
Planète et Univers [physics]| Origine | Fichiers produits par l'(les) auteur(s) |
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