Proc. 14th Ann. Rev. Conf. Atmospheric Transm. Models, 11–12 June 1991; Special Rpt. 267, Phillips Lab., AFSC, (Hanscom AFB, Massachusetts, 1992), 419–428

Laboratory Measurements of the 60-Ghz O2 Spectrum in Air

Cite This Publication

Hans J. Liebe

Abstract:

The O2-spectrum of dry air was studied with a resonance spectrometer under controlled laboratory conditions. Key parts of the instrumentation were an automatic network analyzer and a one-port Fabry-Pérot resonator affording an effective path length of 240 m. Measurements were made at frequencies between 49.3 and 67.2 GHz in 0.1 GHz increments for eleven pressure steps (1–100 kPa) and three different temperatures (7-30- 53°C). More than 5 106 data points (SI parameters) have been recorded and reduced to about 5,000 absorption values α (dB/km). Measurement uncertainties were estimated to be typically the worse of ±0.05 dB/km or 2 percent. The collective spectral behavior of 38 pressure-broadened O2 lines is described by the model MPM (NTIA Report 91-272, March 1991). A comparison of the absorption results with MPM predictions reveals systematic differences which correlate with O2 line width and overlap parameters. An interpretation of the extensive data set with Rosenkranz's overlap theory [JQSRT 39(4), 287–297, 1988] is underway.

Keywords: O2-spectrum

Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

For questions or information on this or any other NTIA scientific publication, contact the ITS Publications Office at ITSinfo@ntia.gov or 303-497-3572.

Back to Search Results