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Performance of Dispersed Fringe Sensor in the Presence of Segmented Mirror Aberrations - Modeling and SimulationsWavefront aberrations will lower the DFS fringe visibility and DFS signal SNR. The specific effect of wavefront aberration on DFS depends on the aberration type. Due to the "pixel spatial filter" effect the extracted DFS signal can tolerate moderate amount of wavefront aberrations..By averaging piston detection results from multiple traces extracted from fringe images DFS can further increase its robustness against wavefront aberration. Line-of-sight jitter can cause significant loss of fringe visibility will affect more on the aberrated system..Modeling results have shown that gravity sag on the JWST segment mirror during I&T will lower the DHS fringe visibility by factor of 2-3X and lower the DHS signal intensity by factor of approx.5X. Under gravity sag the RMS DHS detection error approx. 100 nm.
Document ID
20070012330
Acquisition Source
Jet Propulsion Laboratory
Document Type
Conference Paper
External Source(s)
Authors
Shi, Fang
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Basinger, Scott A.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Redding, David C.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 23, 2013
Publication Date
May 26, 2006
Subject Category
Optics
Meeting Information
Meeting: SPIE Astronomical Telescopes and Instrumentation
Location: Orlando, FL
Country: United States
Start Date: May 24, 2006
End Date: May 31, 2006
Sponsors: International Society for Optical Engineering
Distribution Limits
Public
Copyright
Other
Keywords
James Webb Space Telescope (JWST)
Segmented Mirror Phasing
wavefront sensing and control
space telescopes
infrared astronomy

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