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Proceedings Paper

Focus determination for the James Webb Space Telescope science instruments: a survey of methods
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Paper Abstract

The James Webb Space Telescope (JWST) is a segmented deployable telescope that will require on-orbit alignment using the Near Infrared Camera as a wavefront sensor. The telescope will be aligned by adjusting seven degrees of freedom on each of 18 primary mirror segments and five degrees of freedom on the secondary mirror to optimize the performance of the telescope and camera at a wavelength of 2 microns. With the completion of these adjustments, the telescope focus is set and the optical performance of each of the other science instruments should then be optimal without making further telescope focus adjustments for each individual instrument. This alignment approach requires confocality of the instruments after integration and alignment to the composite metering structure, which will be verified during instrument level testing at Goddard Space Flight Center with a telescope optical simulator. In this paper, we present the results from a study of several analytical approaches to determine the focus for each instrument. The goal of the study is to compare the accuracies obtained for each method, and to select the most feasible for use during optical testing.

Paper Details

Date Published: 13 June 2006
PDF: 11 pages
Proc. SPIE 6265, Space Telescopes and Instrumentation I: Optical, Infrared, and Millimeter, 626512 (13 June 2006); doi: 10.1117/12.673383
Show Author Affiliations
Pamela S. Davila, NASA Goddard Space Flight Ctr. (United States)
Matthew R. Bolcar, The Institute of Optics, University of Rochester (United States)
Brent J. Bos, NASA Goddard Space Flight Ctr. (United States)
Bruce Dean, NASA Goddard Space Flight Ctr. (United States)
John G. Hagopian, NASA Goddard Space Flight Ctr. (United States)
Joseph M. Howard, NASA Goddard Space Flight Ctr. (United States)
Blair L. Unger, NASA Goddard Space Flight Ctr. (United States)
Mark E. Wilson, NASA Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 6265:
Space Telescopes and Instrumentation I: Optical, Infrared, and Millimeter
John C. Mather; Howard A. MacEwen; Mattheus W. M. de Graauw, Editor(s)

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