11 August 2008 Spatially phase-shifted digital speckle pattern interferometry (SPS-DSPI) and cryogenic structures: recent improvements
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Abstract
The Spatially Phase Shifted Digital Speckle Pattern Interferometer (SPS-DSPI) is a speckle pattern interferometer in which the four phase-shifted interferograms are captured simultaneously in a single image. Designed to measure thermal distortions of large matte-surfaced structures for the James Webb Space Telescope (JWST) program, this metrology instrument has been used in two major cryo-distortion tests. This report will describe how differences in the vibrational motions of the test objects necessitated changes in basic algorithms. The authors also report operational upgrades, quantification of uncertainty, and improvement of the software operability with a graphic interface. Results from the tests of the JWST test structures are discussed as illustration.
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Peter Blake, Peter Blake, Perry Greenfield, Perry Greenfield, Warren Hack, Warren Hack, J. Todd Miller, J. Todd Miller, Ivo Busko, Ivo Busko, Babak Saif, Babak Saif, Bente Eegholm, Bente Eegholm, Ritva Keski-Kuha, Ritva Keski-Kuha, Marcel Bluth, Marcel Bluth, } "Spatially phase-shifted digital speckle pattern interferometry (SPS-DSPI) and cryogenic structures: recent improvements", Proc. SPIE 7063, Interferometry XIV: Techniques and Analysis, 706306 (11 August 2008); doi: 10.1117/12.797467; https://doi.org/10.1117/12.797467
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