Cryogenic Optical Position Encoders for Mechanisms in the JWST Optical Telescope Element Simulator (OSIM)
2013
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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