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Proceedings Paper

Development of electronic speckle pattern interferometry for testing JWST composite structures
Author(s): Babak Saif; Marcel Bluth; Bente Eegholm; Perry Greenfield; Warren Hack; Ritva Keski-Kuha; Peter Blake
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Paper Abstract

The stability requirements for the James Webb Space Telescope (JWST) optical metering structure are driven by the science objectives of the mission. This structure, JWST Optical Telescope Element (OTE) primary mirror backplane, has to be stable over time at cryogenic temperatures. Successful development of the large, lightweight, deployable, cryogenic metering structure requires verification of structural deformations to nanometer level accuracy in representative test articles at cryogenic temperature. An instantaneous acquisition phase shifting speckle interferometer was designed and built to support the development of JWST Optical Telescope Element (OTE) primary mirror backplane. This paper discusses characterization of the Electronic Speckle Pattern Interferometer (SPS-DSPI) developed for JWST to verify its capabilities to measure structural deformations in large composite structures at cryogenic temperature. Interferometer performance during the Backplane Stability Test Article (BSTA) test that completed the TRL-6 (Technology Readiness Level-6) demonstration of Large Precision Cryogenic Structures will also be discussed.

Paper Details

Date Published: 20 September 2007
PDF: 10 pages
Proc. SPIE 6687, UV/Optical/IR Space Telescopes: Innovative Technologies and Concepts III, 668704 (20 September 2007); doi: 10.1117/12.734859
Show Author Affiliations
Babak Saif, Space Telescope Science Institute (United States)
Marcel Bluth, ATK Space Systems (United States)
Bente Eegholm, Space Telescope Science Institute (United States)
Perry Greenfield, Space Telescope Science Institute (United States)
Warren Hack, Space Telescope Science Institute (United States)
Ritva Keski-Kuha, NASA Goddard Space Flight Ctr. (United States)
Peter Blake, NASA Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 6687:
UV/Optical/IR Space Telescopes: Innovative Technologies and Concepts III
Howard A. MacEwen; James B. Breckinridge, Editor(s)

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