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Absolute measurements of the atmospheric transparency at short millimetre wavelengths

Rice, David P. and Ade, Peter A. R. 1979. Absolute measurements of the atmospheric transparency at short millimetre wavelengths. Infrared Physics 19 (5) , pp. 575-584. 10.1016/0020-0891(79)90076-9

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Abstract

Spectral measurements of the atmospheric opacity in the 3–13 cm−1 region have been made using a phase-modulated Michelson interferometer. The data are calibrated using a black body source to give absolute measurements. An independent measurement of the total atmospheric water vapour concentration is obtained from a near-infrared hygrometer which is itself calibrated against simultaneous radio sonde data. A theoretical atmospheric transmission model is used to compare the two sets of data. We have found a large discrepancy between our theory and the experimental data amounting to more absorption than predicted. This anomalous absorption shows no spectral features and scales with water vapour concentration. There is no indication of any water vapour dimer lines or of any other minor species features except those due to ozone.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: Elsevier
ISSN: 0020-0891
Last Modified: 04 Jun 2017 06:38
URI: http://orca.cf.ac.uk/id/eprint/63038

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