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Corpus Systématique Végétale

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Microwave measurement of electron density and collision frequency of a pine fire

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  • wildfire
  • microwave attenuation
  • weakly ionised gas
  • chemi-ionisation
  • thermal ionization
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  • Kgakgamatso Mphale 1,2
  • Mal Heron 3
  • 1) Physics Department, University of Botswana, P/Bag 0022. Gaborone, Botswana
  • 2) Author to whom any correspondence should be addressed.
  • 3) Marine Geophysical Laboratory, James Cook Univeristy, Townsville, QLD 4811, Australia

Pinus caribea (pine) litter flame is a weakly ionized medium. Electronneutral collisions are a dominant form of particle interaction in the flame. Assuming flame electrons to be in thermal equilibrium with neutrals and average electronneutral collision frequency to be much higher than the plasma frequency, the propagation of microwaves through the flame is predicted to suffer signal intensity loss. A controlled fire burner was constructed where various natural vegetation species could be used as fuel. The burner was equipped with thermocouples and used as a cavity for microwaves with a laboratory quality network analyser to measure wave attenuation. Electron density and collision frequency were then calculated from the measured attenuation. The parameters are important for numerical prediction of electromagnetic wave propagation in wildfire environments. A controlled pine litter fire with a maximum flame temperature of 1080K was set in the burner and microwaves (810.5GHz) were caused to propagate through the flame. A microwave signal loss of 1.65.8dB was measured within the frequency range. Based on the measured attenuation, electron density and electronneutral collision frequency in pine fire were calculated to range from 0.511.35 1016m3 and 3.435.97 1010s1, respectively.

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  • 1 - natural sciences
  • 2 - physics & astronomy
  • 3 - applied physics
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  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences exactes et technologie
  • 3 - terre, ocean, espace
  • 4 - geophysique externe
Catégories Scopus
  • 1 - Physical Sciences ; 2 - Materials Science ; 3 - Surfaces, Coatings and Films
  • 1 - Physical Sciences ; 2 - Physics and Astronomy ; 3 - Acoustics and Ultrasonics
  • 1 - Physical Sciences ; 2 - Physics and Astronomy ; 3 - Condensed Matter Physics
  • 1 - Physical Sciences ; 2 - Materials Science ; 3 - Electronic, Optical and Magnetic Materials
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  • 1 - science ; 2 - physics, applied
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Journal of Physics D: Applied Physics

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