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Proceedings Paper

Palomar Testbed Interferometer
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Paper Abstract

The Palomar Testbed Interferometer (PTI) is an infrared, phase-tracking interferometer in operation at Palomar Mountain since July 1995. It was funded by NASA for the purpose of developing techniques and methodologies for doing narrowangle astrometry for the purpose of detecting extrasolar planets. The instrument employs active fringe trackingin the infrared (2.0-2.4 μm) to monitor fringe phase. It is a dual-star interferometer; it is able to measure fringes on two separate stars simultaneously. An end-to-end heterodyne laser metrology system is used to monitor the optical path length of the starlight. Recently completed engineering upgrades have improved the initial instrument performance. These upgrades are:extended wavelength coverage, a single mode fiber for spatial filtering, vacuum pipes to relay the beams, accelerometers on the siderostat mirrors and a new baseline. Results of recent astrometry data indicate the instrument is approaching the astrometric limit as set by the atmosphere.

Paper Details

Date Published: 24 July 1998
PDF: 8 pages
Proc. SPIE 3350, Astronomical Interferometry, (24 July 1998); doi: 10.1117/12.317154
Show Author Affiliations
J. Kent Wallace, Jet Propulsion Lab. (United States)
Andrew F. Boden, Jet Propulsion Lab. (United States)
M. Mark Colavita, Jet Propulsion Lab. (United States)
Philip J. Dumont, Jet Propulsion Lab. (United States)
Yekta Gursel, Jet Propulsion Lab. (United States)
Braden E. Hines, Jet Propulsion Lab. (United States)
Christopher D. Koresko, California Institute of Technology (United States)
Shrinivas R. Kulkarni, California Institute of Technology (United States)
Benjamin F. Lane, Jet Propulsion Lab. (United States)
Fabien Malbet, Observatoire de Grenoble (France)
Dean L. Palmer, Jet Propulsion Lab. (United States)
Xiaopei Pan, California Institute of Technology (United States)
Michael Shao, Jet Propulsion Lab. (United States)
Gautam Vasisht, Jet Propulsion Lab. (United States)
Gerard Theodore van Belle, Jet Propulsion Lab. (United States)
Jeffrey W. Yu, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 3350:
Astronomical Interferometry
Robert D. Reasenberg, Editor(s)

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