Fringe tracking at the MROI

2008 ◽  
Author(s):  
C. A. Jurgenson ◽  
F. G. Santoro ◽  
F. Baron ◽  
K. McCord ◽  
E. K. Block ◽  
...  
Keyword(s):  
Fringe Tracking

scholarly journals Comparison of fringe-tracking algorithms for single-mode near-infrared long-baseline interferometers

2014 ◽  
Vol 569 ◽  
pp. A2 ◽  
Author(s):  
É. Choquet ◽  
J. Menu ◽  
G. Perrin ◽  
F. Cassaing ◽  
S. Lacour ◽  
...  
Keyword(s):  
Near Infrared ◽  
Single Mode ◽  
Long Baseline ◽  
Tracking Algorithms ◽  
Fringe Tracking

Multiple Beam Fringe Tracking at VLTI

2007 ◽  
pp. 331-335
Author(s):  
M. Gai ◽  
D. Bonino ◽  
L. Corcione ◽  
D. Gardiol ◽  
M. G. Lattanzi ◽  
...  
Keyword(s):  
Multiple Beam ◽  
Fringe Tracking

scholarly journals Integrated Optics in Astronomical Interferometry

1994 ◽  
Vol 158 ◽  
pp. 261-271 ◽  
Author(s):  
V. Coudé du Foresto
Keyword(s):  
Integrated Optics ◽  
Single Mode ◽  
Spatial Filtering ◽  
Coherent Beam ◽  
Optical Components ◽  
Polarization Behavior ◽  
Integrated Optical ◽  
Fringe Tracking ◽  
And Control

Integrated optical components (mostly single-mode fibers and couplers) can be used to achieve several functions that are needed in interferometry: coherent beam transportation and recombination, pathlength modulation and control for fringe tracking and double Fourier interferometry, spatial filtering of the wavefront and interferogram calibration. Their potential is assessed and the main problems encountered in their implementation are discussed: dispersion, polarization behavior, and especially starlight injection.

scholarly journals PHASE-REFERENCED INTERFEROMETRY AND NARROW-ANGLE ASTROMETRY WITH SUSI

2013 ◽  
Vol 02 (02) ◽  
pp. 1340011 ◽  
Author(s):  
Y. KOK ◽  
M. J. IRELAND ◽  
P. G. TUTHILL ◽  
J. G. ROBERTSON ◽  
B. A. WARRINGTON ◽  
...  
Keyword(s):  
Binary Stars ◽  
Photon Counting ◽  
Current Phase ◽  
Common Path ◽  
Narrow Angle ◽  
Stellar Interferometer ◽  
Dual Beam ◽  
Beam Combiner ◽  
Visible Wavelengths ◽  
Fringe Tracking

The Sydney University Stellar Interferometer (SUSI) now incorporates a new beam combiner, called the Microarc-second University of Sydney Companion Astrometry instrument (MUSCA), for the purpose of high precision differential astrometry of bright binary stars. Operating in the visible wavelength regime where photon-counting and post-processing fringe tracking is possible, MUSCA will be used in tandem with SUSI's primary beam combiner, Precision Astronomical Visible Observations (PAVO), to record high spatial resolution fringes and thereby measure the separation of fringe packets of binary stars. In its current phase of development, the dual beam combiner configuration has successfully demonstrated for the first time a dual-star phase-referencing operation in visible wavelengths. This paper describes the beam combiner optics and hardware, the network of metrology systems employed to measure every non-common path between the two beam combiners and also reports on a recent narrow-angle astrometric observation of δ Orionis A (HR 1852) as the project enters its on-sky testing phase.

scholarly journals NAOMI: the adaptive optics system of the Auxiliary Telescopes of the VLTI

2019 ◽  
Vol 629 ◽  
pp. A41 ◽  
Author(s):  
J. Woillez ◽  
J. A. Abad ◽  
R. Abuter ◽  
E. Aller Carpentier ◽  
J. Alonso ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Single Mode ◽  
Large Telescope ◽  
Wavefront Correction ◽  
Design Performance ◽  
Very Large Telescope ◽  
Fringe Tracking ◽  
Adaptive Optics System ◽  
Atmospheric Seeing

Context. The tip-tilt stabilisation system of the 1.8 m Auxiliary Telescopes of the Very Large Telescope Interferometer was never dimensioned for robust fringe tracking, except when atmospheric seeing conditions are excellent. Aims. Increasing the level of wavefront correction at the telescopes is expected to improve the coupling into the single-mode fibres of the instruments, and enable robust fringe tracking even in degraded conditions. Methods. We deployed a new adaptive optics module for interferometry (NAOMI) on the Auxiliary Telescopes. Results. We present its design, performance, and effect on the observations that are carried out with the interferometric instruments.

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