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Airborne Measurements Of Infrared Atmospheric Radiance And Sky Noise

A series of 23 data flights was made using the 30 cm telescope on board the NASA Lear Jet Observatory to investigate the magnitude and spatial structure of IR atmospheric radiance in the spectral region 5 to 30 μm. Data were obtained in five wavebands with two multi-channel, Ge:Cu, detector systems having IFOV's of 200 and 500 μrad. Measurements were made in three geographical locations: 9°, 35° and 60° north latitude and at altitudes from 15 to 45 kft. A dual channel spectrum analyzer was used to process the recorded data which included a number of accelerometer channels. A high level of excess noise on the IR signals was observed during flight and was due to vibration effects and cabin gas leaks. The RMS value of the spatial variations in the atmospheric background was estimated to be less than 7 x 10-5 to 10-3 times the DC sky radiance. This result is discussed in terms of a theo-retical model for sky noise based on upper atmospheric turbulence. Values for the in-band sky radiance are compared to the AFGL atmospheric model calculations.