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Wavefront Sensing with the Fine Guidance Sensor for James Webb Space TelescopeAn analysis is presented that utilizes the Fine Guidance Sensor (FGS) for focal-plane wavefront sensing (WFS) for the James Webb Space Telescope (JWST). WFS with FGS increases the number of wavefront measurements taken in field of the telescope, but has many challenges over the other JWST instruments that make it unique, such as; less sampling of the Point Spread Function (PSF), a smaller diversity-defocus range, a smaller image detector size, and a polychromatic object or source. Additionally, presented is an analysis of sampling for wavefront sensing. Results are shown based on simulations of flight and the cryogenic optical testing at NASA Johnson Space Center.
Document ID
20080031700
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Smith, J. Scott
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Aronstein, David
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Dean, Bruce H.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Howard,Joe
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Shiri, Ron
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 24, 2013
Publication Date
June 23, 2008
Subject Category
Instrumentation And Photography
Meeting Information
Meeting: SPIE Astronomical Instrumentation Conference
Location: Marseilles
Country: France
Start Date: June 23, 2008
End Date: June 28, 2008
Sponsors: International Society for Optical Engineering
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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