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Proceedings Paper

The Fizeau interferometer testbed (FIT): developing and testing the technologies needed for space-based interferometric imaging systems
Author(s): Lisa M. Mazzuca; Kenneth G. Carpenter; Richard G. Lyon; Joe Marzouk; Peter Petrone III; Paul Cottle; Peter Dogoda; Hubert Huet; Peter Liiva; David Mozurkewich; J. Thomas Armstrong; Xiaolei Zhang; Gregory Solyar; Lee G. Mundy
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Paper Abstract

The Fizeau Interferometer Testbed (FIT) is a ground-based laboratory experiment at Goddard Space Flight Center (GSFC) designed to develop and test technologies that will be needed for future interferometric spacecraft missions. Specifically, the research from this experiment is a proof-of-concept for optical accuracy and stability, closed-loop control algorithms, optimal sampling methodology of the Fourier UV-plane, computational models for system performance, and image synthesis techniques for a sparse array of 7 to 30 mirrors. It will assess and refine the technical requirements on hardware, control, and imaging algorithms for the Stellar Imager (SI), its pathfinder mission, and other sparse aperture and interferometric imaging mission concepts. This ground-based optical system is a collaborative effort between NASA's GSFC, Sigma Space Corporation, the Naval Research Laboratory, and the University of Maryland. We present an overview of the FIT design goals and explain their associated validation methods. We further document the design requirements and provide a status on their completion. Next, we show the overall FIT design, including the optics and data acquisition process. We discuss the technologies needed to insure success of the testbed as well as for an entire class of future mission concepts. Finally, we compare the expected performance to the actual performance of the testbed using the initial array of seven spherical mirrors. Currently, we have aligned and phased all seven mirrors, demonstrated excellent system stability for extended periods of time, and begun open-loop operations using "pinhole" light sources. Extended scenes and calibration masks are being fabricated and will shortly be installed in the source module. Installation of all the different phase retrieval/diversity algorithms and control software is well on the way to completion, in preparation for future tests of closed-loop operations.

Paper Details

Date Published: 20 October 2004
PDF: 9 pages
Proc. SPIE 5491, New Frontiers in Stellar Interferometry, (20 October 2004); doi: 10.1117/12.550450
Show Author Affiliations
Lisa M. Mazzuca, NASA Goddard Space Flight Ctr. (United States)
Kenneth G. Carpenter, NASA Goddard Space Flight Ctr. (United States)
Richard G. Lyon, NASA Goddard Space Flight Ctr. (United States)
Joe Marzouk, Sigma Space Corp. (United States)
Peter Petrone III, Sigma Space Corp. (United States)
Paul Cottle, Sigma Space Corp. (United States)
Peter Dogoda, Sigma Space Corp. (United States)
Hubert Huet, Sigma Space Corp. (United States)
Peter Liiva, Sigma Space Corp. (United States)
David Mozurkewich, Seabrook Engineering (United States)
J. Thomas Armstrong, Naval Research Lab. (United States)
Xiaolei Zhang, Naval Research Lab. (United States)
Gregory Solyar, NASA Goddard Space Flight Ctr. (United States)
Lee G. Mundy, Univ. of Maryland/College Park (United States)

Published in SPIE Proceedings Vol. 5491:
New Frontiers in Stellar Interferometry
Wesley A. Traub, Editor(s)

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