Application of adaptive optics to the GI2T/REGAIN interferometer

摘要

The GI2T is a multi-speckle Michelson stellar interferometer of two 1.5 m telescopes operating in the visible and near infrared wavelengths. The REGAIN project (REcombinateur du GrAnd INterferometre) which consists of the renewal of the whole instrument is now nearly completed and the next step of the developments on GI2T will be the implantation of adaptive optics systems in each interferometric arm. In this paper we show that the data reduction methods of speckle interferometry that have been applied to the GI2T under pure turbulence, are also valid when the images are partially corrected by adaptive optics. Some simulation results show the expected performances in terms of signal-to-noise ratio for typcial observation conditions. We also tackle the problem of piston control by a bimorph deformable mirror. The last section presents instrumental aspects of the foreseen AO system and the current status of the integration of the first wavefront sensor.