GRAVITY: design and performance of the fringe tracker

E. Choquet; F. Cassaing; G. Perrin; F. Eisenhauer; W. Brandner; C. Straubmeier; K. Perraut; S. Gillessen

doi:10.1117/12.855984

21 July 2010 GRAVITY: design and performance of the fringe tracker

E. Choquet, F. Cassaing, G. Perrin, F. Eisenhauer, W. Brandner, C. Straubmeier, K. Perraut, S. Gillessen

Proceedings Volume 7734, Optical and Infrared Interferometry II; 77341Z (2010) https://doi.org/10.1117/12.855984
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

GRAVITY is a second generation instrument for the VLTI. It will combine four telescopes in the K band and perform fringe tracking on stars as faint as 10 magnitude with a lambda/8 accuracy, thus counterbalancing atmospheric piston and UTs longitudinal vibrations, despite flux drop-outs due to residual tip-tilt jitter. To achieve such a performance, new developments have to be tested. We have developed a complete simulator so as to improve algorithms and establish an efficient fringe tracking strategy. In addition, a prototype of the fringe tracker for GRAVITY is being built up in order to demonstrate the results of this simulator. We present here the current status of these developments, achieved by simulating realistic tracking at VLTI.

Citation Download Citation

E. Choquet, F. Cassaing, G. Perrin, F. Eisenhauer, W. Brandner, C. Straubmeier, K. Perraut, and S. Gillessen "GRAVITY: design and performance of the fringe tracker", Proc. SPIE 7734, Optical and Infrared Interferometry II, 77341Z (21 July 2010); https://doi.org/10.1117/12.855984

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