B
J
Last name: BORGNINO
First name: J.
Astronomy with High Contrast Imaging, eds. C. Aime and R. Soummer, EAS Publications Series 12, (2003)
Proceedings of the Symposium on Seeing, n/a, pp. 31-36 (2007)
Proceedings of the Symposium on Seeing, n/a, pp. 208-209 (2007)
MNRAS, 378, pp. 1177-1186 (2007)
Conference OSA - Adaptive Optics : Analysis and Methods Meeting, n/a, (2007)
MNRAS, 377, pp. 1236-1244 (2007)
Proceedings of the Symposium on Seeing, n/a, pp. 26-28 (2007)
To reach a high performance with an adaptive optics system, we need a calibration using a reference source. This latter should be located in the same isoplanatic domain as the science source. Different techniques and methods have been developed leading to estimations of the isoplanatic patch but all are model-dependent. We developed a new...
A new method is proposed for the verification of the atmospheric turbulence model. It is based on the reconstruction of the phase structure function from simultaneous measurements of the Angle-of-Arrival longitudinal covariance at different baselines with the Generalized Seeing Monitor (GSM). In addition, with this new technique we obtain the...
International audience
The HAR observing methods such as Adaptive Optics and Interferometery, require a better understanding of the behavior of the perturbed wavefronts, more exactly a better knowledge of the atmospheric turbulence model in addition to the associate parameters. This is very crucial for modeling the HAR techniques and particularly for the evaluation...
Astronomy and Astrophysics, v. 448, p. 1225-1234, 2006. http://dx.doi.org/10.1051/0004-6361:20052806
Astron. & Astrophys., 448, pp. 1225-1234 (2006)
Astronomy and Astrophysics, v. 448, p. 1225-1234, 2006. http://dx.doi.org/10.1051/0004-6361:20052806
International audience
Wide-Field Adaptive Optics (WFAO) have been proposed for the next generation of telescopes. In order to be efficient, correction using WFAO require knowledge of atmospheric turbulence parameters. The structure constant of index-of-refraction fluctuations (C2 N ) being one of them. Indirect methods implemented in instruments as SCIDAR, MASS,...
To reach a suitable limiting magnitude with a multi-aperture interferometer, we need tocophase the different telescopes using a reference source. The latter should be located in thesame isopistonic domain as the science source. We developed a direct analytical expressionof deducing the isopistonic angle from atmospheric optical parameters as...
Appl. Opt., 43, pp. 2316-2324 (2004)
The main atmospheric optical parameters have been measured at the Calar Alto Observatory simultaneously using the Generalized Seeing Monitor (GSM) and a Differential Image Motion Monitor (DIMM) during several nights in 2002 May. The temporal evolution of the seeing, the outer scale, the isoplanatic angle and the coherence time have been...
n/a, Revista Mexicana de Astronomia y Astrofisica (Serie de Conferencias) 19, pp. 31-36 (2003)
International audience
PICARD is a space mission developed to observe the Sun at high angular resolution. One of the main space objectives of PICARD is to measure the solar diameter with few milli arc-seconds accuracy. A replica of the space instrument will be installed at Calern Observatory in order to test our ability to make such measurement from ground with...
With the prospect of the next generation of ground-based telescopes, the extremely large telescopes, increasingly complex and demanding adaptive optics systems are needed. This is to compensate for image distortion caused by atmospheric turbulence and fully take advantage of mirrors with diameters of 30-40 m. This requires a more precise...