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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 421607.0, MPI für Astronomie / Publikationen_mpia
Fringe tracking optimization with 4 beams: application to GRAVITY
Authors:Houairi, K.; Cassaing, F.; Perrin, G.; Eisenhauer, F.; Brandner, W.; Straubmeier, C.; Gillessen, S.
Language:English
Publisher:SPIE
Place of Publication:Bellingham, Wash.
Date of Publication (YYYY-MM-DD):2008
Title of Proceedings:Optical and Infrared Interferometry
Start Page:70131B-70131B
End Page:12
Title of Series:SPIE
Volume (in Series):7013
Name of Conference/Meeting:Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series
Review Status:not specified
Audience:Not Specified
Abstract / Description:GRAVITY, a VLTI second generation instrument, requires a fringe tracker combining four beams. Its design is driven by the observation of the Galactic Center and implies stringent fringe sensor specifications. We present the simulations of the fringe tracking closed-loop performance with an optical path difference (OPD) turbulence spectrum using a Kolmogorov model of the atmosphere for typical seeing conditions at VLTI (r0 = 0.95 m, t0 = 47 ms at 2.2 mum). We show that the total residual OPD standard deviation can be as low as lambda/12 at a sampling frequency of 350 Hz on a guide star with a magnitude of mK = 10. To obtain this performance, we compared several 4-beam pairwise co-axial combination conceptual architectures and show that the optimal 4-beam combination is the one measuring the OPD on the six baselines.
Comment of the Author/Creator:Date: 2008, July 1, 2008
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2008SPIE.7013E..36H [ID No:1]
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