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Microwave absorption of oxygen measured with a Fabry-Perot spectrometerA semiconfocal configuration of a Fabry-Perot interferometer is described, which can be used for measuring moderately weak absorption at a fixed microwave frequency as a function of pressure by measuring the change in the Q of the system when the gas is introduced. An accuracy of 0.3 dB/km at 58.82 GHz is achieved with just conventional laboratory equipment. The absorption need not be resonant, and can be determined as a function of such physical factors as pressure, temperature, and mixture composition. Oxygen absorption measurements support calculations based on theories of line overlap inside the oxygen absorption band at subatmospheric pressure.
Document ID
19770049008
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Poon, R. K. L.
(MIT Cambridge, Mass., United States)
Date Acquired
August 8, 2013
Publication Date
May 1, 1977
Publication Information
Publication: Journal of Quantitative Spectroscopy and Radiative Transfer
Volume: 17
Subject Category
Atomic And Molecular Physics
Accession Number
77A31860
Funding Number(s)
CONTRACT_GRANT: NAS5-21980
CONTRACT_GRANT: NAS7-100
Distribution Limits
Public
Copyright
Other

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