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13 September 2012 Cryogenic photogrammetry and radiometry for the James Webb Space Telescope microshutters
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Abstract
The James Webb Space Telescope (JWST) relies on several innovations to complete its five year mission. One vital technology is microshutters, the programmable field selectors that enable the Near Infrared Spectrometer (NIRSpec) to perform multi-object spectroscopy. Mission success depends on acquiring spectra from large numbers of galaxies by positioning shutter slits over faint targets. Precise selection of faint targets requires field selectors that are both high in contrast and stable in position. We have developed test facilities to evaluate microshutter contrast and alignment stability at their 35K operating temperature. These facilities used a novel application of image registration algorithms to obtain non-contact, sub-micron measurements in cryogenic conditions. The cryogenic motion of the shutters was successfully characterized. Optical results also demonstrated that shutter contrast far exceeds the NIRSpec requirements. Our test program has concluded with the delivery of a flight-qualified field selection subsystem to the NIRSpec bench.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Victor J. Chambers, Peter A. Morey, Barbara J. Zukowski, Alexander S. Kutyrev, Nicholas R. Collins, David A. Rapchun, Nargess Memarsadeghi, Samuel H. Moseley, Leroy M. Sparr, and Peter N. Blake "Cryogenic photogrammetry and radiometry for the James Webb Space Telescope microshutters", Proc. SPIE 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 84501F (13 September 2012); https://doi.org/10.1117/12.924171
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