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Title: Performance of dispersed fringe sensor in the presence of segmented mirror aberrations – modeling and simulation
Authors: Shi, Fang
Basinger, Scott A.
Redding, David C.
Keywords: wavefront sensing and control
dispersed fringe sensor
segmented mirrors
James Webb Space Telescope (JWST)
wavefront aberration
Issue Date: 24-May-2006
Publisher: Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2006.
Citation: SPIE Astronomical Telescopes 2006 : Space Telescopes and Instrumentation I: Optical, Infrared, and Millimeter, Orlando, Florida, May 24 -31, 2006
Abstract: Dispersed Fringe Sensing (DFS) is an efficient and robust method for coarse phasing of a segmented primary mirror such as the James Webb Space Telescope (JWST). In this paper, modeling and simulations are used to study the effect of segmented mirror aberrations on the fringe image, DFS signals and DFS detection accuracy. The study has shown due to the pixilation spatial filter effect from DFS signal extraction the effect of wavefront error is reduced and DFS algorithm will be more robust against wavefront aberration by using multi-trace DFS approach. We also studied the JWST Dispersed Hartmann Sensor (DHS) performance in presence of wavefront aberrations caused by the gravity sag and we use the scaled gravity sag to explore the JWST DHS performance relationship with the level of the wavefront aberration. This also includes the effect from line-of-sight jitter.
Appears in Collections:JPL TRS 1992+

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