The Two-Beam IR Beam Combiner at the CHARA Array

Details The Two-Beam IR Beam Combiner at the CHARA Array The Two-Beam IR Beam Combiner at the CHARA Array

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.6103s&link_type=abstract

American Astronomical Society, 198th AAS Meeting, #61.03; Bulletin of the American Astronomical Society, Vol. 33, p.876

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The two-beam combination and IR detection system serves as a test and commissioning instrument during the integration phase of the CHARA Array. This two-beam IR system is capable of providing new and interesting astronomical data by combining the light from any two of the six telescopes in the array. Fringes are produced using a classical Michelson interferometer, and are imaged to single element InSb nitrogen cooled detectors. After a dichroic split, data are collected simultaneously in H and K bands around 1.6 and 2.2 microns. There are four detectors, two for each wavelength band. The low-pass filtered detector signals are digitized and recorded individually. During data collection, a real time display of the raw or band-pass filtered data is available. We are also able to see the fringes in real time by displaying sums and differences of the channels. In one arm of the interferometer, a mirror is mounted on a piezoelectric translation stage, which is driven by a saw tooth periodic voltage typically of 1 Hz. With this dithering mirror, we are able to sweep back and forth through the fringes, which allows a high rate of data acquisition for good statistics, and provides a simple means of fringe tracking. The CHARA Array, a six-telescope O/IR interferometric array operated by Georgia State University was funded by the National Science Foundation, the W. M. Keck Foundation, the David and Lucile Packard Foundation, and the Georgia State University.

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