28 September 2011 Cryogenic thermal distortion performance characterization for the JWST ISIM structure
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Abstract
The James Webb Space Telescope (JWST) Integrated Science Instrument Module (ISIM) Structure is a precision optical metering structure for the JWST science instruments. Optomechanical performance requirements place stringent limits on the allowable thermal distortion of the metering structure between ambient and cryogenic operating temperature (~35 K). This paper focuses on thermal distortion testing and successful verification of performance requirements for the flight ISIM Structure. The ISIM Structure Cryoset Test was completed in Spring 2010 at NASA Goddard Space Flight Center in the Space Environment Simulator Chamber. During the test, the ISIM Structure was thermal cycled twice between ambient and cryogenic (~35 K) temperatures. Photogrammetry was used to measure the Structure in the ambient and cryogenic states for each cycle to assess both cooldown thermal distortion and repeatability. This paper will provide details on the post-processing of the metrology datasets completed to compare measurements with performance requirements.
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John Johnston, John Johnston, Emmanuel Cofie, Emmanuel Cofie, Jason Hylan, Jason Hylan, Raymond Ohl, Raymond Ohl, Maria Nowak, Maria Nowak, Douglas McGuffey, Douglas McGuffey, James Pontius, James Pontius, Eric Johnson, Eric Johnson, } "Cryogenic thermal distortion performance characterization for the JWST ISIM structure", Proc. SPIE 8150, Cryogenic Optical Systems and Instruments XIII, 815009 (28 September 2011); doi: 10.1117/12.893932; https://doi.org/10.1117/12.893932
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