Abstract
Experimental results are given for the absorption coefficient of atmospheric water vapor γ in the longwave region of the submillimeter range. The measurements were made under natural conditions by the varying humidity and varying distance methods, with a monochromatic source of radiation. The smallest values of absorption occurred in the range λ=1–1.15 mm; here under normal atmospheric conditions (p=760 mm Hg, T=293° K, ρ0=7.5 g/m3), γ varied from 5.5–3.5 dB/km. In the other relative transparency window, λ=0.87 mm, the absorption coefficient was equal to 10.8 dB/km. The experimental results are compared with theoretical calculations.
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