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Proceedings Paper

Measuring NIRCam's position and orientation in 6 DOF using one reference mirror surface inside an environmental chamber
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 background that created the innovative techniques used to measure NIRCam’s modules alignments in 6 degrees of freedom (DOF) inside a thermal vacuum chamber. All 6 DOF were measured remotely, through a single chamber window port, using only a flat reference mirror/reticle surface mounted on each module. This measured orientation was then used to determine the optical input axis and entrance pupil for each module. 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: 6 pages
Proc. SPIE 9582, Optical System Alignment, Tolerancing, and Verification IX, 958209 (3 September 2015); doi: 10.1117/12.2189098
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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