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Proceedings Paper

Segmented mirror coarse phasing with a dispersed fringe sensor: experiments on NGST's wavefront control testbed
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Paper Abstract

A piston sensing and control algorithm for segmented mirror coarse phasing using a dispersed fringe sensor (DFS) has been developed for the Next Generation Space Telescope (NGST) wavefront sensing and control. The DFS can detect residual piston errors as large as the order of a depth-of-focus and can phase the segment mirrors with accuracy better than 0.1 microns, which is well within the capture range of fine phasing for NGST. A series of experiments have been carried out on the NGST's Wavefront Control Testbed (WCT) to validate the modeling results, evaluate the DFS performance, and systematically explore the factors that affect the DFS performance. This paper reports the testbed results for several critical issues of DFS performance, including DFS dynamic range, accuracy, fringe visibility, and the effects of segment mirror aberrations.

Paper Details

Date Published: 5 March 2003
PDF: 11 pages
Proc. SPIE 4850, IR Space Telescopes and Instruments, (5 March 2003); doi: 10.1117/12.461113
Show Author Affiliations
Fang Shi, Jet Propulsion Lab. (United States)
David C. Redding, Jet Propulsion Lab. (United States)
Andrew E. Lowman, Jet Propulsion Lab. (United States)
Charles W. Bowers, NASA Goddard Space Flight Ctr. (United States)
Laura A. Burns, Science Systems and Applications Inc. (United States)
Peter Petrone, ManTech Systems Engineering Corp. (United States)
Catherine Mayumi Ohara, Jet Propulsion Lab. (United States)
Scott A. Basinger, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 4850:
IR Space Telescopes and Instruments
John C. Mather, Editor(s)

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