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Instrument: AERI : Atmospheric Emitted Radiance Interferometer
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The AERI instrument is an advanced version of the high spectral
resolution interferometer sounder (HIS) designed and fabricated
at the University of Wisconsin (Revercomb et al. 1988) to
measure upwelling infrared radiances from an aircraft. The AERI
is a fully automated ground-based passive infrared
interferometer that measures downwelling atmospheric radiance
from 3.3 - 18.2 mm (550 - 3000 cm-1) at less than 10-minute
temporal resolution with a spectral resolution of one
wavenumber. Careful attention to calibration results in an
absolute calibration accuracy of better than 1% of the
ambient. The AERI instrument foreoptics consist of a scene
mirror and two calibration blackbodies. These blackbodies are
essential to provide a well known stable hot and ambient
temperature reference for calibration of the downwelling skyview
radiances. A typical measurement cycle consists of a
three-minute sky dwell period followed by two-minute dwell
periods for each of the blackbodies. While the interferometer
acquires an uncalibrated spectrum every two seconds, averaging
reduces the radiometric noise in the measurements. The
temperature of one of the blackbodies is fixed at 60 oC, while
the other fluctuates with the ambient temperature.

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[Extracted from the AERI Homepage]