ON THE PROPAGATION OF VLF WAVES IN SOLIDS

Abstract

In the report, different measuring devices, transmitting and receiving antennas (direction-finder antennas) for the VLF region are discussed. The measurements of propagation in inhomogeneous rock are mainly concentrated to the determination of the direction of the field vector at the point of reception. The problem near field - far field of a VLF dipole is also discussed. In order to determine the electrical parameters of rock, comprehensive measurements were conducted in solid rock and in rock samples, furthermore the frequency dependence of sigma and epsilon was studied. The influence of the gallery configuration on the result of a sigma-measurement was studied in detail. The theoretical part mainly deals with the problems of excitation of a VLF wave in rock, giving a detailed comparison between electrical and magnetic dipoles.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1964
Accession Number
AD0613593

Entities

People

  • W. Bitterlich

Organizations

  • University of Innsbruck

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Amplifiers
  • Antenna Radiation Patterns
  • Antennas
  • Capacitance
  • Cathode Followers
  • Dielectric Permittivity
  • Electromagnetic Fields
  • Far Field
  • Ferrites
  • Magnetic Dipoles
  • Magnetic Fields
  • Measurement
  • Moisture Content
  • Near Field
  • Radiation Resistance
  • Resonant Circuits
  • Resonant Frequency

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Geotechnical Engineering.