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Differential phase technique with the Keck Interferometer

Akeson, Rachel L. and Swain, Mark R. and Colavita, M. Mark (2000) Differential phase technique with the Keck Interferometer. In: Interferometry in Optical Astronomy. Proceedings of SPIE. No.4006. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, pp. 321-327. ISBN 9780819436313.

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We present the motivation and development of the novel `differential phase' technique being developed for the Keck Interferometer with the goal of detecting faint companions near a bright source. The differential phase technique uses simultaneous phase measurements at several infrared wavelengths to detect the astrophysical signature produced by a chromatic, asymmetric brightness distribution. We discuss the origin of the differential phase signature and present results of test observations taken at the Palomar Testbed Interferometer. One important test result is the larger than expected effect of water vapor turbulence on these multi-wavelength observations due to the infrared dispersion of water. In order to reach the design goal of 0.1 milliradians, the phase noise caused by both temperature and water vapor fluctuations in the atmosphere must be corrected, and we discuss several ways to achieve this.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Akeson, Rachel L.0000-0001-9674-1564
Swain, Mark R.0000-0002-0919-4468
Additional Information:© 2000 Society of Photo-Optical Instrumentation Engineers (SPIE). This work was performed at the Infrared Processing and Analysis Center, California Institute of Technology and the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. Interferometer data were obtained at Palomar Observatory using the NASA Palomar Testbed Interferometer supported by NASA contracts to the Jet Propulsion Laboratory and observations at PTI are made possible through the efforts of the PTI Collaboration (http : // Funding for the Keck Interferometer provided by the National Aeronautics and Space Administration.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:infrared interferometry, atmospheric dispersion
Series Name:Proceedings of SPIE
Issue or Number:4006
Record Number:CaltechAUTHORS:20181204-132723256
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Official Citation:Rachel L. Akeson, Mark R. Swain, M. Mark Colavita, "Differential phase technique with the Keck Interferometer," Proc. SPIE 4006, Interferometry in Optical Astronomy, (5 July 2000); doi: 10.1117/12.390222
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91460
Deposited By: George Porter
Deposited On:06 Dec 2018 18:33
Last Modified:16 Nov 2021 03:41

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