16 November 2000 SWIFT instrument testbed for stratospheric wind measurements
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Abstract
The Stratospheric Wind Interferometer for Transport Studies is a limb viewing satellite instrument which is intended to measure stratospheric wind velocities in the altitude range of 20 to 40 km. Tandem etalon filters made of Germanium and a field-widened Michelson interferometer operating in mid- infrared are major components of this instrument. A He-Ne laser and a CCD camera were used to observe Haidinger and Fizeau fringes in visible light and compare their characteristics with mid-infrared measurements. The Fizeau fringes in the visible can be used to observe the irregularities in the Michelson interferometer's path difference. In addition a CO2 laser operating at 9.26 micrometers has been used to test the Michelson interferometer and the filters together. The filters are thermally tuned to the CO2 laser line and the filter output was incident on a diffuse surface in front of the Michelson input aperture. The Michelson interferometer was then pressure scanned to observe its performance in combination with the filters.
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Reza Mani, Reza Mani, William A. Gault, William A. Gault, Stephen Brown, Stephen Brown, } "SWIFT instrument testbed for stratospheric wind measurements", Proc. SPIE 4131, Infrared Spaceborne Remote Sensing VIII, (16 November 2000); doi: 10.1117/12.406537; https://doi.org/10.1117/12.406537
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