Verification of the James Webb Space Telescope Integrated Science Instrument Module cryogenic structural alignment requirements via photogrammetry

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

doi:10.1117/12.798791

2 September 2008 Verification of the James Webb Space Telescope Integrated Science Instrument Module cryogenic structural alignment requirements via photogrammetry

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

Author Affiliations +

Proceedings Volume 7068, Optical System Alignment and Tolerancing II; 70680Q (2008) https://doi.org/10.1117/12.798791
Event: Optical Engineering + Applications, 2008, San Diego, California, United States

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.

Citation Download Citation

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, and 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); https://doi.org/10.1117/12.798791

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