12 September 2012 Demonstration of the wide-field imaging interferometer testbed using a calibrated hyperspectral image projector
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The Wide-field Imaging Interferometer testbed (WIIT) at NASA’s Goddard Space Flight Center uses a dual-Michelson interferometric technique. The WIIT combines stellar interferometry with Fourier-transform interferometry to produce high-resolution spatial-spectral data over a large field-of-view. This combined technique could be employed on future NASA missions such as the Space Infrared Interferometric Telescope (SPIRIT) and the Sub-millimeter Probe of the Evolution of Cosmic Structure (SPECS). While both SPIRIT and SPECS would operate at far-infrared wavelengths, the WIIT demonstrates the dual-interferometry technique at visible wavelengths. The WIIT will produce hyperspectral image data, so a true hyperspectral object is necessary. A calibrated hyperspectral image projector (CHIP) has been constructed to provide such an object. The CHIP uses Digital Light Processing (DLP) technology to produce customized, spectrally-diverse scenes. CHIP scenes will have approximately 1.6-micron spatial resolution and the capability of producing arbitrary spectra in the band between 380 nm and 1.6 microns, with approximately 5-nm spectral resolution. Each pixel in the scene can take on a unique spectrum. Spectral calibration is achieved with an onboard fiber-coupled spectrometer. In this paper we describe the operation of the CHIP. Results from the WIIT observations of CHIP scenes will also be presented.
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Matthew R. Bolcar, Matthew R. Bolcar, David Leisawitz, David Leisawitz, Stephen Maher, Stephen Maher, Stephen Rinehart, Stephen Rinehart, "Demonstration of the wide-field imaging interferometer testbed using a calibrated hyperspectral image projector", Proc. SPIE 8445, Optical and Infrared Interferometry III, 84452D (12 September 2012); doi: 10.1117/12.926221; https://doi.org/10.1117/12.926221

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