Wide-field imaging interferometry testbed I: purpose, testbed design, data, and synthesis algorithms

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

doi:10.1117/12.460704

26 February 2003 Wide-field imaging interferometry testbed I: purpose, testbed design, data, and synthesis algorithms

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

Author Affiliations +

Proceedings Volume 4852, Interferometry in Space; (2003) https://doi.org/10.1117/12.460704
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

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 ~λ_c/d_tel 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 N_pix × N_pix 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 N_pix/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.

Citation Download Citation

David T. Leisawitz, Brad J. Frey, Douglas B. Leviton, Anthony J. Martino, William L. Maynard, Lee G. Mundy, Stephen A. Rinehart, Stacy H. Teng, and Xiaolei Zhang "Wide-field imaging interferometry testbed I: purpose, testbed design, data, and synthesis algorithms", Proc. SPIE 4852, Interferometry in Space, (26 February 2003); https://doi.org/10.1117/12.460704

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