8 April 2003 Filters and calibration for the SWIFT instrument on GCOM-A1
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The SWIFT instrument is an imaging, field-widened Michelson interferometer designed to measure stratospheric winds passively from orbit by detecting the Doppler shift of naturally occurring O3 thermal emission. It has been selected for flight on NASDA's GCOM-A1 satellite, scheduled for launch in 2007. It is similar in principle to the Wind Imaging Interferometer (WINDII) on UARS but whereas WINDII operates in the visible with a CCD detector, SWIFT will operate at a wavelength of 8.823μm and use a HgCdTe array detector. This spectral region is very crowded with emission lines and a substantial effort was needed to select appropriate candidate lines. Designing filters for this instrument has also proved to be challenging because of the narrow bandwidth required to isolate the emission line, combined with the need to fill the field of view and minimize the effects of thermal drifts. SWIFT will carry blackbody sources for responsivity calibrations and three NH3 cells that provide a narrow emission line to be used as a secondary phase standard. This paper discusses the design of the filters for SWIFT and associated calibration issues.
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William A. Gault, William A. Gault, Ian C. McDade, Ian C. McDade, Yves J. Rochon, Yves J. Rochon, Alan Scott, Alan Scott, } "Filters and calibration for the SWIFT instrument on GCOM-A1", Proc. SPIE 4881, Sensors, Systems, and Next-Generation Satellites VI, (8 April 2003); doi: 10.1117/12.463000; https://doi.org/10.1117/12.463000

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