Characterization of cryo-vacuum chamber windows for NIRCam instrument alignment and testing

Paul F. Schweiger; Torben B. Andersen

doi:10.1117/12.2189099

3 September 2015 Characterization of cryo-vacuum chamber windows for NIRCam instrument alignment and testing

Paul F. Schweiger, Torben B. Andersen

Proceedings Volume 9582, Optical System Alignment, Tolerancing, and Verification IX; 95820A (2015) https://doi.org/10.1117/12.2189099
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

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.

Citation Download Citation

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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