SWIFT: an infrared Doppler Michelson interferometer for measuring stratospheric winds

William A. Gault; Ian C. McDade; Gordon G. Shepherd; Reza Mani; Stephen Brown; Phil Gregory; Alan Scott; Yves J. Rochon; Wayne F. J. Evans

doi:10.1117/12.450694

12 December 2001 SWIFT: an infrared Doppler Michelson interferometer for measuring stratospheric winds

William A. Gault, Ian C. McDade, Gordon G. Shepherd, Reza Mani, Stephen Brown, Phil Gregory, Alan Scott, Yves J. Rochon, Wayne F. J. Evans

Author Affiliations +

Proceedings Volume 4540, Sensors, Systems, and Next-Generation Satellites V; (2001) https://doi.org/10.1117/12.450694
Event: International Symposium on Remote Sensing, 2001, Toulouse, France

Abstract

The Stratospheric Wind Interferometer For Transport studies (SWIFT) is a passive sensor designed to measure winds in the stratosphere from a satellite. It is a field-widened Michelson interferometer very similar to the WINDII instrument on UARS but operates in the mid-IR, where it detects the Doppler shifts of atmospheric thermal emission lines of ozone. SWIFT uses a HgCdTe array detector to view the emission at the Earth's limb. Measurements are subsequently inverted by computer to obtain true vertical profiles of the stratospheric wind in the altitude range 20 to 40 km. Two orthogonal fields of view allow wind vectors to be obtained by combining the components observed from different directions a few minutes apart. Prototype Ge wafer etalon filters and a field-widened Michelson interferometer for the Mid-IR have been built and tested, with good results. Modeling studies indicate that a measurement precision of 5 m/s can be obtained throughout the altitude range of interest. In addition to the winds, SWIFT will measure ozone densities in the stratosphere. SWIFT has been selected for flight on NASDA's GCOM-A1 satellite and a Phase A study is being supported by ESA and the Canadian Space Agency.

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William A. Gault, Ian C. McDade, Gordon G. Shepherd, Reza Mani, Stephen Brown, Phil Gregory, Alan Scott, Yves J. Rochon, and Wayne F. J. Evans "SWIFT: an infrared Doppler Michelson interferometer for measuring stratospheric winds", Proc. SPIE 4540, Sensors, Systems, and Next-Generation Satellites V, (12 December 2001); https://doi.org/10.1117/12.450694

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