Interest of a double field interferometer at Dome C

Details Interest of a double field interferometer at Dome C Interest of a double field interferometer at Dome C

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008spie.7013e..27v&link_type=abstract

Optical and Infrared Interferometry. Edited by Schöller, Markus; Danchi, William C.; Delplancke, Françoise. Proceedings of the

Computer Science

Performance

Scientific paper

Long baseline interferometry now faces two main challenges. The first one is the image reconstruction from interferometric data. Indeed, the reduced information on the phase of the object Fourier transform during an observation makes image reconstruction quite critical. The second challenge is the improvements of the overall sensitivity. Strong improvement are expected from double field interferometry : For instance, double field interferometry enables phase referencing which is a way to obtain information on phases. In addition, double field interferometry increases the sensitivity of an interferometer. In this paper we present simulations of double field interferometry. Our simulations take into account; the turbulence conditions, the detection noise, the fringe tracking error. For simulated double field data, we perform an image reconstruction using the coaddition of fringes in the image plane. Since the performances of a double field interferometer are very closely related to and dependent on the site characteristics we studied the results for two different locations: Paranal and Dome C. The comparison shows that Dome C offers much better results, and that it is probably the best site on Earth to build a double-field interferometer.

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