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Proceedings Paper

Models for VLTI fringe sensor units: FINITO and PRIMA FSUs
Author(s): Donata Bonino; Mario Gai; Leonardo Corcione; Giuseppe Massone
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Paper Abstract

The VLTI system foresees two generations of fringe sensor: FINITO and PRIMA FSUs. The former is dedicated to H band; it controls the internal OPD with a temporal modulation with an external reference OPD. The latter, working with the ABCD model and in K band, is based on the introduction of known phase offsets for the interferometric signal (spatial phase modulation) and on the measurement of the corresponding combined power. Simulation models for both FSUs are developed with Matlab. Instrumental parameters, i.e. phase, transmission, visibility, are tabulated for ease of maintenance and to speed execution time. For the use of siderostats, due to fast turbulence, the need for intensity calibration arises. Assuming slow intensity variations with respect to phase variations, different algorithms can apply, yielding to numerical control of perturbations as a function of model parameters.

Paper Details

Date Published: 20 October 2004
PDF: 11 pages
Proc. SPIE 5491, New Frontiers in Stellar Interferometry, (20 October 2004); doi: 10.1117/12.550361
Show Author Affiliations
Donata Bonino, INAF, Osservatorio Astronomico di Torino (Italy)
Mario Gai, INAF, Osservatorio Astronomico di Torino (Italy)
Leonardo Corcione, INAF, Osservatorio Astronomico di Torino (Italy)
Giuseppe Massone, INAF, Osservatorio Astronomico di Torino (Italy)

Published in SPIE Proceedings Vol. 5491:
New Frontiers in Stellar Interferometry
Wesley A. Traub, Editor(s)

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