The measurement of absolute absorption of millimeter radiation in gases: the absorption of Co and O/sub 2

An apparatus is described that will measure absolute absorption of millimeter radiation in gases. The method measures the change in the quality factor of a Fabry-Perot resonator with and without gas present. The magnitude of the change is interpreted in terms of the absorption of the lossy medium in...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 1988-08, Vol.36 (8), p.1136-1143
Main Authors: Read, W.G., Hillig, K.W., Cohen, E.A., Pickett, H.M.
Format: Article
Language:English
Subjects:
Electromagnetic wave absorption
Extraterrestrial measurements
Fabry-Perot
Gases
Geophysical measurements
Laboratories
Mirrors
Optical resonators
Propulsion
Spectroscopy
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Summary:An apparatus is described that will measure absolute absorption of millimeter radiation in gases. The method measures the change in the quality factor of a Fabry-Perot resonator with and without gas present. The magnitude of the change is interpreted in terms of the absorption of the lossy medium inside the resonator. Experiments have been performed on the 115 GHz CO line and the 119 GHz O/sub 2/ line at two different temperatures to determine the linewidth parameter and the peak absorption value. These numbers can be combined to give the integrated intensity which can be accurately calculated from results of spectroscopy measurements. The CO results are within 2% percent of theoretically predicted valves. Measurements on O/sub 2/ have shown that absorption can be measured as 0.5 dB/km with this technique. Results have been obtained for oxygen absolute absorption in the 60-80 GHz region.< >
ISSN:0018-926X
1558-2221
DOI:10.1109/8.7226