Nom du corpus

Corpus Systématique Végétale

Titre du document

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

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Éditeur
IOP
Langue(s) du document
Anglais
Type de document
Research-article
Mots-clés d'auteur
  • wildfire
  • microwave attenuation
  • weakly ionised gas
  • chemi-ionisation
  • thermal ionization
Nom du fichier dans la ressource
Syst_veg6_v2_002102
Auteur(s)
  • Kgakgamatso Mphale 1,2
  • Mal Heron 3
Affiliation(s)
  • 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
Résumé

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.

Catégories Science-Metrix
  • 1 - natural sciences
  • 2 - physics & astronomy
  • 3 - applied physics
Catégories INIST
  • 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
Catégories WoS
  • 1 - science ; 2 - physics, applied
Identifiant ISTEX
2ECEE7522599B76B1757A23C3E9F62FBED7A94E1
Revue

Journal of Physics D: Applied Physics

Année de publication
2007
Présence de XML structuré
Oui
Score qualité du texte
9.128
Version PDF
1.4
Type de publication
Journal
ark:/67375/0T8-J3NQGWZB-4
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