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Frank H. Murcray, Frank J. Murcray, David G. Murcray, James Pritchard, George Vanasse, and Hajime Sakai


A cryogenically cooled FTS system capable of a spectral resolution of 0.06 cm−1 is described. The entire interferometer is operated at LN2 temperature with the exception of the Ge:Cu detector, which is cooled to below 10 K. In order to maintain alignment while the unit is cold, a cat's eye optical system was employed, and all mechanical components fabricated from the same stress-relieved steel.

The system was constructed to measure atmospheric emission spectra from a balloon platform. The requirements on the electronics and data handling systems imposed by the remote operation and balloon environment are discussed.

Some data obtained on a balloon flight launched on 23 October 1983 are presented. These show that the instrument has the sensitivity to measure the atmospheric emission at high altitudes with the spectral resolution desired (0.06 cm−1).

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David G. Murcray, James N. Brooks, Frank H. Murcray, and Walter J. Williams


A balloon flight made 4 February 1970 with an infrared spectral radiometer system scanning from 10 to 13 μm ascended through an extensive cirrus cloud. This allowed measurements to be made of the spectral radiance of the cloud both underneath and in the cloud as the balloon ascended. The spectra obtained are presented and the data were used to determine the emissivity of the cloud at 11 μm. The value ∈=0.38 is in reasonable agreement with values found by Kuhn and Weickmann.

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