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Proceedings Paper

Wide-field imaging interferometry testbed I: purpose, testbed design, data, and synthesis algorithms
Author(s): David T. Leisawitz; Brad J. Frey; Douglas B. Leviton; Anthony J. Martino; William L. Maynard; Lee G. Mundy; Stephen A. Rinehart; Stacy H. Teng; Xiaolei Zhang
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Paper Abstract

The Wide-field Imaging Interferometry Testbed was designed to validate, experiment with, and refine the technique of wide field mosaic imaging for optical/IR interferometers. We offer motivation for WIIT, present the testbed design, and describe algorithms that can be used to reduce the data from a spatial and spectral Michelson interferometer. A conventional single-detector Michelson interferometer operating with narrow bandwidth at center wavelength lc is limited in its field of view to the primary beam of the individual telescope apertures, or ~λc/dtel radians, where dtel is the telescope diameter. Such a field is too small for many applications; often one wishes to image extended sources. We are developing and testing techniques analogous to the mosaicing method employed in millimeter and radio astronomy, but applicable to optical/IR Michelson interferometers, in which beam combination is done in the pupil plane. An Npix × Npix array detector placed in the image plane of the interferometer is used to record simultaneously the fringe patterns from many contiguous telescope fields, effectively multiplying the field size by Npix/2, where the factor 2 allows for Nyquist sampling. This technique will be especially valuable for interferometric space observatories, such as the Space Infrared Interferometric Telescope and the Submillimeter Probe of the Evolution of Cosmic Structure.

Paper Details

Date Published: 26 February 2003
PDF: 13 pages
Proc. SPIE 4852, Interferometry in Space, (26 February 2003); doi: 10.1117/12.460704
Show Author Affiliations
David T. Leisawitz, NASA Goddard Space Flight Ctr. (United States)
Brad J. Frey, NASA Goddard Space Flight Ctr. (United States)
Douglas B. Leviton, NASA Goddard Space Flight Ctr. (United States)
Anthony J. Martino, NASA Goddard Space Flight Ctr. (United States)
William L. Maynard, NASA Goddard Space Flight Ctr. (United States)
Lee G. Mundy, Univ. of Maryland/College Park (United States)
Stephen A. Rinehart, NASA Goddard Space Flight Ctr. (United States)
National Research Council (United States)
Stacy H. Teng, Univ. of Maryland/College Park (United States)
Xiaolei Zhang, Science Systems and Applications Inc. (United States)

Published in SPIE Proceedings Vol. 4852:
Interferometry in Space
Michael Shao, Editor(s)

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