The Atmospheric Water Vapor Continuum Below 300 GHz

Abstract

Absolute attenuation rates due to water vapor and moist nitrogen have been measured in the laboratory at 138 GHz, 282 and 300 K, pressures up to 1.5 atm, and relative humidities from 80 to 100 percent. The computer-controlled measuring system is comprsied of a millimeter wave resonance spectrometer (0.15 km effective path length) and a humidity simulator. Several shortcoming sof earlier measurement attempts have been rectified. The data are interpreted as a water vapor continuum spectrum consisting of two terms, namely strong self-broadening (H2O-H2O) plus foreign-gas-broadening (H2O-N2) contributions. Implications of the new results for modeling atmospheric EHF window tranparencies and for revising established H2O line broadening theory are discussed.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1984
Accession Number
ADA138592

Entities

People

  • Hans J. Liebe

Tags

Communities of Interest

  • Energy and Power Technologies
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • 5G Wireless Networks
  • Attenuation
  • Computers
  • Frequency
  • Humidity
  • Measurement
  • Meteorological Phenomena
  • Millimeter Waves
  • Nitrogen
  • Radio Waves
  • Resonance
  • Simulators
  • Spectra
  • Spectrometers
  • Vapor Pressure
  • Water Vapor
  • Wave Propagation

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Plasma Physics.
  • Radio communications and signal processing.

Technology Areas

  • 5G