Limits to the Sub-millimetre Isotropic Background
A PHASE-MODULATED Michelson interferometer1 and a helium cooled Rollin2 photoconductive far infrared detector, at the focus of a 35 cm aperture Cassegrain telescope, were flown at a height of 12.1 km from the Royal Aircraft Establishment, Farnborough, in a Comet 2E aircraft, on November 11, 12 and 16, 1971. The emission spectrum of the stratosphere
Beckman, J. E. et al.
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1972