2 September 2008 Verification of the James Webb Space Telescope Integrated Science Instrument Module cryogenic structural alignment requirements via photogrammetry
Author Affiliations +
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.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Maria Nowak, Maria Nowak, Paul Cleveland, Paul Cleveland, Allen Crane, Allen Crane, Pamela Davila, Pamela Davila, Acey Herrera, Acey Herrera, Jason Hylan, Jason Hylan, Andrew Liehr, Andrew Liehr, James Marsh, James Marsh, Raymond Ohl, Raymond Ohl, Kevin Redman, Kevin Redman, Henry Sampler, Henry Sampler, Joseph Stock, Joseph Stock, Greg Wenzel, Greg Wenzel, Robert Woodruff, Robert Woodruff, Philip Young, Philip Young, } "Verification of the James Webb Space Telescope Integrated Science Instrument Module cryogenic structural alignment requirements via photogrammetry", Proc. SPIE 7068, Optical System Alignment and Tolerancing II, 70680Q (2 September 2008); doi: 10.1117/12.798791; https://doi.org/10.1117/12.798791
PROCEEDINGS
12 PAGES


SHARE
Back to Top