12 September 2012 Wide-field imaging interferometry spatial-spectral image synthesis algorithms
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Abstract
The Wide-Field Imaging Interferometry Testbed (WIIT) is a wide-field spectral imaging Michelson interferometer developed at the NASA/Goddard Space Flight Center. WIIT is operational and effectively demonstrates imaging and spectroscopy over fields-of-view larger than the narrow primary beam footprint of a conventional Michelson interferometer. At the heart of this technique is the "double-Fourier" approach whereby the apertures and a delay line are both moved to collect interferograms over a 2D wide field detector grid simultaneously; one interferogram per detector pixel. This aggregate set of interferograms, as a function of baseline and delay line, is algorithmically processed to construct a single spatial-spectral cube with angular resolution approaching the ratio of the wavelength to the longest baseline. Herein we develop the mathematical spatial-spectral imaging model and the baseline processing algorithm and show results using simulated data and using WIIT testbed data.
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R. G. Lyon, D. T. Leisawitz, S. A. Rinehart, N. Memarsadeghi, E. Sinukoff, "Wide-field imaging interferometry spatial-spectral image synthesis algorithms", Proc. SPIE 8445, Optical and Infrared Interferometry III, 84450B (12 September 2012); doi: 10.1117/12.926920; https://doi.org/10.1117/12.926920
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