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Proceedings Paper

Characterization of cryo-vacuum chamber windows for NIRCam instrument alignment and testing
Author(s): Paul F. Schweiger; Torben B. Andersen
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Paper 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.

Paper Details

Date Published: 3 September 2015
PDF: 9 pages
Proc. SPIE 9582, Optical System Alignment, Tolerancing, and Verification IX, 95820A (3 September 2015); doi: 10.1117/12.2189099
Show Author Affiliations
Paul F. Schweiger, Lockheed Martin Space Systems Co. (United States)
Torben B. Andersen, Lockheed Martin Space Systems Co. (United States)

Published in SPIE Proceedings Vol. 9582:
Optical System Alignment, Tolerancing, and Verification IX
José Sasián; Richard N. Youngworth, Editor(s)

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