Interest of a double field interferometer at Dome C

B. Valat; F. X. Schmider; B. Lopez; O. Michel

doi:10.1117/12.789270

28 July 2008 Interest of a double field interferometer at Dome C

B. Valat, F. X. Schmider, B. Lopez, O. Michel

Proceedings Volume 7013, Optical and Infrared Interferometry; 701310 (2008) https://doi.org/10.1117/12.789270
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

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.

Citation Download Citation

B. Valat, F. X. Schmider, B. Lopez, and O. Michel "Interest of a double field interferometer at Dome C", Proc. SPIE 7013, Optical and Infrared Interferometry, 701310 (28 July 2008); https://doi.org/10.1117/12.789270

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