3 September 2015 Measuring NIRCam's position and orientation in 6 DOF using one reference mirror surface inside an environmental chamber
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Proceedings Volume 9582, Optical System Alignment, Tolerancing, and Verification IX; 958209 (2015); doi: 10.1117/12.2189098
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 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.
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Paul F. Schweiger, Torben B. Andersen, "Measuring NIRCam's position and orientation in 6 DOF using one reference mirror surface inside an environmental chamber", Proc. SPIE 9582, Optical System Alignment, Tolerancing, and Verification IX, 958209 (3 September 2015); doi: 10.1117/12.2189098; https://doi.org/10.1117/12.2189098
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KEYWORDS
Reticles

James Webb Space Telescope

Cameras

Mirrors

Cryogenics

Environmental sensing

Autocollimation

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