FLUOR fibered instrument at the IOTA interferometer

Details FLUOR fibered instrument at the IOTA interferometer FLUOR fibered instrument at the IOTA interferometer

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3350..856c&link_type=abstract

Proc. SPIE Vol. 3350, p. 856-863, Astronomical Interferometry, Robert D. Reasenberg; Ed.

Astronomy and Astrophysics

Astronomy

40

Scientific paper

The FLUOR project started in 1991 with a prototype fiber recombination unit that transformed a pair of independent 80 cm telescopes into a stellar interferometer. An improved version of this unit is now used as part of the instrumentation at the IOTA interferometer on Mt. Hopkins. The system is based on fluoride glass single-mode waveguides for observations at IR wavelengths between 2 and 2.4 micrometers . A triple coupler performs the coherent recombination of the beams and extracts two calibration signals. A passive polarization control is sufficient to maintain the interferometric efficiency above 80 percent, with variations of the order of a few percents form one night to the next. The combination FLUOR/IOTA now routinely provides stellar interferograms on baselines ranging between 5 and 38 m, with an accuracy of 1 percent or better in the fringe visibility measurements.

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