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3 September 2015 Characterization of cryo-vacuum chamber windows for NIRCam instrument alignment and testing
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Abstract
The Near Infrared Camera (NIRCam) instrument used to align and obtain science data for NASA’s James Webb Space Telescope (JWST) was tested at the module level at flight-like cryogenic temperature. This paper explains the innovative techniques used to measure the precise location and orientation of the modules. A laser tracker was used to precision locate the instrument, using a flat reference mirror/reticle surface on the modules inside a chamber through its port windows. This technique established 6 degrees of freedom of position and orientation. The accuracy achieved was on the order of 20 microns in position and 5 arc-seconds in angular orientation.
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Paul F. Schweiger and Torben B. Andersen "Characterization of cryo-vacuum chamber windows for NIRCam instrument alignment and testing", Proc. SPIE 9582, Optical System Alignment, Tolerancing, and Verification IX, 95820A (3 September 2015); https://doi.org/10.1117/12.2189099
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