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Proceedings Paper

Cryogenic optical position encoders for mechanisms in the JWST optical telescope element simulator (OSIM)
Author(s): Douglas B. Leviton; Thomas Anderjaska; James Badger; Tom Capon; Clinton Davis; Brent Dicks; William Eichhorn; Mario Garza; Corina Guishard; Shadan Haghani; Claef Hakun; Paul Haney; David Happs; Lars Hovmand; Madhu Kadari; Jeffrey Kirk; Richard Nyquist; F. David Robinson; Joseph Sullivan; Erin Wilson
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Paper Abstract

The JWST Optical Telescope Element Simulator (OSIM) is a configurable, cryogenic, optical stimulus for high fidelity ground characterization and calibration of JWST’s flight instruments. OSIM and its associated Beam Image Analyzer (BIA) contain several ultra-precise, cryogenic mechanisms that enable OSIM to project point sources into the instruments according to the same optical prescription as the flight telescope will image stars – correct in focal surface position and chief ray angle. OSIM’s and BIA’s fifteen axes of mechanisms navigate according to redundant, cryogenic, absolute, optical encoders – 32 in all operating at or below 100 K. OSIM’s encoder subsystem, the engineering challenges met in its development, and the encoders’ sub-micron and sub-arcsecond performance are discussed.

Paper Details

Date Published: 27 September 2013
PDF: 12 pages
Proc. SPIE 8863, Cryogenic Optical Systems and Instruments 2013, 886306 (27 September 2013); doi: 10.1117/12.2024807
Show Author Affiliations
Douglas B. Leviton, NASA Goddard Space Flight Ctr. (United States)
Thomas Anderjaska, Northrop Grumman Aerospace Systems (United States)
James Badger, Ball Aerospace and Technologies Corp. (United States)
Tom Capon, NASA Goddard Space Flight Ctr. (United States)
Clinton Davis, Orbital Sciences Corp. (United States)
Brent Dicks, Ball Aerospace and Technologies Corp. (United States)
William Eichhorn, NASA Goddard Space Flight Ctr. (United States)
Mario Garza, Orbital Sciences Corp. (United States)
Corina Guishard, NASA Goddard Space Flight Ctr. (United States)
Shadan Haghani, Northrop Grumman Aerospace Systems (United States)
Claef Hakun, NASA Goddard Space Flight Ctr. (United States)
Paul Haney, NASA Goddard Space Flight Ctr. (United States)
David Happs, Ball Aerospace and Technologies Corp. (United States)
Lars Hovmand, Northrop Grumman Aerospace Systems (United States)
Madhu Kadari, Jackson and Tull (United States)
Jeffrey Kirk, Orbital Sciences Corp. (United States)
Richard Nyquist, Ball Aerospace and Technologies Corp. (United States)
F. David Robinson, Orbital Sciences Corp. (United States)
Joseph Sullivan, Ball Aerospace and Technologies Corp. (United States)
Erin Wilson, Genesis Engineering Solutions, Inc. (United States)


Published in SPIE Proceedings Vol. 8863:
Cryogenic Optical Systems and Instruments 2013
James B. Heaney; E. Todd Kvamme, Editor(s)

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