Continued development of a precision cryogenic dilatometer for the James Webb Space Telescope

Details Continued development of a precision cryogenic dilatometer for the James Webb Space Telescope Continued development of a precision cryogenic dilatometer for the James Webb Space Telescope

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004spie.5528...63k&link_type=abstract

Space Systems Engineering and Optical Alignment Mechanisms. Edited by Peterson, Lee D.; Guyer, Robert C. Proceedings of the

Physics

Scientific paper

As part of the James Webb Space Telescope (JWST) materials working group, a novel cryogenic dilatometer was designed and built at NASA Jet Propulsion Laboratory to help address stringent coefficient of thermal expansion (CTE) knowledge requirements. Previously reported results and error analysis have estimated a CTE measurement accuracy for ULE of 1.7 ppb/K with a 20K thermal load and 0.1 ppb/K with a 280K thermal load. Presented here is a further discussion of the cryogenic dilatometer system and a description of recent work including system modifications and investigations.

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