Physics – Optics
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apopt..14.3086w&link_type=abstract
Applied Optics, vol. 14, Dec. 1975, p. 3086-3091. USAF-ARPA-supported research
Physics
Optics
Auroras, Cryogenic Equipment, Infrared Spectrometers, Optical Filters, Rocket-Borne Instruments, Atmospheric Radiation, Cooling Systems, Design Analysis, Emission Spectra, Liquid Helium
Scientific paper
An IR spectrometer used to obtain atmospheric emission spectra from a rocket at altitudes between 45 km and 200 km in an auroral measurement program is described. The instrument continuously scans the 6.75-23.2-micron 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 of the spectrometer at 22 microns is better than 1 times 10 to the minus 11th W per sq cm per sr per micron. The dominant high altitude atmospheric emission features observed on two rocket flights were 9.6-micron O3 and 15-micron CO2.
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