Cryogenic optical position encoders for mechanisms in the JWST optical telescope element simulator (OSIM)

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

doi:10.1117/12.2024807

27 September 2013 Cryogenic optical position encoders for mechanisms in the JWST optical telescope element simulator (OSIM)

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

Author Affiliations +

Proceedings Volume 8863, Cryogenic Optical Systems and Instruments 2013; 886306 (2013) https://doi.org/10.1117/12.2024807
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

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.

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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, and Erin Wilson "Cryogenic optical position encoders for mechanisms in the JWST optical telescope element simulator (OSIM)", Proc. SPIE 8863, Cryogenic Optical Systems and Instruments 2013, 886306 (27 September 2013); https://doi.org/10.1117/12.2024807

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