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Palomar Testbed Interferometer

Wallace, J. K. and Boden, A. F. and Colavita, M. M. and Dumont, P. and Gursel, Y. and Hines, B. and Koresko, C. and Kulkarni, S. and Lane, B. and Malbet, F. and Palmer, D. and Pan, X. P. and Shao, M. and Vasisht, G. and van Belle, G. and Yu, J. (1998) Palomar Testbed Interferometer. In: Astronomical Interferometry. Proceedings of SPIE. No.3350. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, pp. 864-871. ISBN 0819427977.

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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.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Kulkarni, S.0000-0001-5390-8563
Vasisht, G.0000-0002-1871-6264
van Belle, G.0000-0002-8552-158X
Additional Information:© 1998 Society of Photo-Optical Instrumentation Engineers (SPIE). Funding for the development of PTI was provided by NASA under its TOPS (Towards Other Planetary Systems) and ASEPS (Astronomical Studies of Extrasolar Planetary Systems) programs, and from the JPL Director's Discretionary Fund. Ongoing funding has been provided by NASA through its Origins Program and from the JPL Directors Research and Development Fund. Thanks to Kadri Vural and Rockwell International for the NICMOS-3 detectors. The work reported here was performed at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.
Funding AgencyGrant Number
JPL Director's Discretionary FundUNSPECIFIED
JPL Research and Technology Development FundUNSPECIFIED
Subject Keywords:optical interferometry, astrometry, extrasolar planets
Series Name:Proceedings of SPIE
Issue or Number:3350
Record Number:CaltechAUTHORS:20180713-141501863
Persistent URL:
Official Citation:J. Kent Wallace, Andrew F. Boden, M. Mark Colavita, Philip J. Dumont, Yekta Gursel, Braden E. Hines, Christopher D. Koresko, Shrinivas R. Kulkarni, Benjamin F. Lane, Fabien Malbet, Dean L. Palmer, Xiaopei Pan, Michael Shao, Gautam Vasisht, Gerard Theodore van Belle, Jeffrey W. Yu, "Palomar Testbed Interferometer", Proc. SPIE 3350, Astronomical Interferometry, (24 July 1998); doi: 10.1117/12.317154;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87844
Deposited By: George Porter
Deposited On:13 Jul 2018 23:13
Last Modified:16 Nov 2021 00:21

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