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Proceedings Paper

Statistical analysis of the surface figure of the James Webb Space Telescope
Author(s): Paul A. Lightsey; David Chaney; Benjamin B. Gallagher; Bob J. Brown; Koby Smith; John Schwenker
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Paper Abstract

The performance of an optical system is best characterized by either the point spread function (PSF) or the optical transfer function (OTF). However, for system budgeting purposes, it is convenient to use a single scalar metric, or a combination of a few scalar metrics to track performance. For the James Webb Space Telescope, the Observatory level requirements were expressed in metrics of Strehl Ratio, and Encircled Energy. These in turn were converted to the metrics of total rms WFE and rms WFE within spatial frequency domains. The 18 individual mirror segments for the primary mirror segment assemblies (PMSA), the secondary mirror (SM), tertiary mirror (TM), and Fine Steering Mirror have all been fabricated. They are polished beryllium mirrors with a protected gold reflective coating. The statistical analysis of the resulting Surface Figure Error of these mirrors has been analyzed. The average spatial frequency distribution and the mirror-to-mirror consistency of the spatial frequency distribution are reported. The results provide insight to system budgeting processes for similar optical systems.

Paper Details

Date Published: 21 September 2012
PDF: 14 pages
Proc. SPIE 8442, Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave, 84422F (21 September 2012); doi: 10.1117/12.924836
Show Author Affiliations
Paul A. Lightsey, Ball Aerospace & Technologies Corp. (United States)
David Chaney, Ball Aerospace & Technologies Corp. (United States)
Benjamin B. Gallagher, Ball Aerospace & Technologies Corp. (United States)
Bob J. Brown, Ball Aerospace & Technologies Corp. (United States)
Koby Smith, Ball Aerospace & Technologies Corp. (United States)
John Schwenker, Ball Aerospace & Technologies Corp. (United States)


Published in SPIE Proceedings Vol. 8442:
Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave
Mark C. Clampin; Giovanni G. Fazio; Howard A. MacEwen; Jacobus M. Oschmann, Editor(s)

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