Abstract

An ir spectrometer used to obtain atmospheric emission spectra from a rocket at altitudes between 45 km and 200 km in the ICECAP Auroral Measurements Program is described. The instrument continuously scans the 6.75–23.2-μm spectral region at the rate of 2 scans/sec. The spectral resolution of the instrument, which employs a circular-variable interference filter (CVF), ranges from 3% to 4%. The entire optical subsection, silicon-arsenic detector, CVF, Irtran 6 lens, baffle, and removable cold cover are cooled below 10 K in a high-vacuum Dewar system. The noise equivalent spectral radiance (NESR) of the spectrometer at 22 μm is better than 1 × 10−11 (W cm−2sr−1μm−1). The dominant high altitude atmospheric emission features observed on two rocket flights were 9.6-μm O3 and 15-μm CO2.

© 1975 Optical Society of America

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