Electronic Speckle Pattern Interferom-etry for JWVST

Saif, Babak; Bluth, Marcel; Eegholm, Bente; Zukowski, Barbara; Keski-Kuha, Ritva; Blake, P.

doi:10.1109/aero.2007.353007

Cited by 1 publication

(1 citation statement)

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“…Commonly used methods for introducing deformations, such as precision motorized steppers or piezo-electric manipulators do not currently provide the accuracy, precision and resolution required to calibrate SPS-DSPI. Instead, a novel method of introducing a well-known deformation was introduced 11,12 ; a single crystal silicon monolith Calibration Reference Article (CRA) was developed, designed to provide a predictable and uniform Coefficient of Thermal Expansion (CTE) and therefore a known change in height between reference surfaces when exposed to a temperature change. This allowed characterization of the relative accuracy of the interferometer in the nm regime.…”

Section: Calibration Reference Articlementioning

confidence: 99%

Development of electronic speckle pattern interferometry for testing JWST composite structures

et al. 2007

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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.

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Section: Calibration Reference Articlementioning

confidence: 99%