10 June 2006 Performance of dispersed fringe sensor in the presence of segmented mirror aberrations: modeling and simulation
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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 DFS fringe image, its signals, and the piston detection accuracy. The simulations show that due to the pixilation spatial filter effect from DFS signal extraction the effect of wavefront error is reduced. In addition, the DFS algorithm is more robust against wavefront aberration when the multi-trace DFS approach is used. We have also studied the JWST Dispersed Hartmann Sensor (DHS) performance in presence of wavefront aberrations caused by the gravity sag and we have used the scaled gravity sag to explore the JWST DHS performance relationship with the level of the wavefront aberration. As a special case of aberration we have also included the effect from line-of-sight jitter in the JWST modeling study.
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Fang Shi, Scott A. Basinger, David C. Redding, "Performance of dispersed fringe sensor in the presence of segmented mirror aberrations: modeling and simulation", Proc. SPIE 6265, Space Telescopes and Instrumentation I: Optical, Infrared, and Millimeter, 62650Y (10 June 2006); doi: 10.1117/12.672714; https://doi.org/10.1117/12.672714
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