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Proceedings Paper

Verification of the James Webb Space Telescope Integrated Science Instrument Module cryogenic structural alignment requirements via photogrammetry
Author(s): Maria Nowak; Paul Cleveland; Allen Crane; Pamela Davila; Acey Herrera; Jason Hylan; Andrew Liehr; James Marsh; Raymond Ohl; Kevin Redman; Henry Sampler; Joseph Stock; Greg Wenzel; Robert Woodruff; Philip Young
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Paper Abstract

The alignment philosophy of the James Webb Space Telescope (JWST) Integrated Science Instrument Module (ISIM) is such that the cryogenic changes in the alignment of the science instruments (SIs) and telescope-related interfaces are captured in an alignment error budget. The SIs are aligned to the structure's coordinate system under ambient, clean room conditions using laser tracker and theodolite metrology. The ISIM structure is thermally cycled and temperature-induced mechanical and structural changes are concurrently measured to ensure they are within the predicted boundaries. We report on the ISIM photogrammetry system and its role in the cryogenic verification of the ISIM structure. We describe the cryogenic metrology error budget and the analysis and testing that was performed on the ISIM mockup, a full scale aluminum model of the ISIM structure, to ensure that the system design allows the metrology goals to be met, including measurement repeatability and distortion introduced from the camera canister windows.

Paper Details

Date Published: 2 September 2008
PDF: 12 pages
Proc. SPIE 7068, Optical System Alignment and Tolerancing II, 70680Q (2 September 2008); doi: 10.1117/12.798791
Show Author Affiliations
Maria Nowak, NASA Goddard Space Flight Ctr. (United States)
Paul Cleveland, Energy Solutions International, LLC (United States)
Allen Crane, Alliant Techsystems Inc. (United States)
Pamela Davila, NASA Goddard Space Flight Ctr. (United States)
Acey Herrera, NASA Goddard Space Flight Ctr. (United States)
Jason Hylan, NASA Goddard Space Flight Ctr. (United States)
Andrew Liehr, Stinger Ghaffarian Technologies (United States)
James Marsh, NASA Goddard Space Flight Ctr. (United States)
Raymond Ohl, NASA Goddard Space Flight Ctr. (United States)
Kevin Redman, QinetiQ, Inc. (United States)
Henry Sampler, NASA Goddard Space Flight Ctr. (United States)
Joseph Stock, Stinger Ghaffarian Technologies (United States)
Greg Wenzel, QinetiQ, Inc. (United States)
Robert Woodruff, Lockheed Martin Space Systems Co. (United States)
Philip Young, Young Engineering Services, Inc. (United States)


Published in SPIE Proceedings Vol. 7068:
Optical System Alignment and Tolerancing II
José M. Sasian; Richard Neil Youngworth, Editor(s)

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