ON THE PROPAGATION OF VLF WAVES IN SOLIDS
Annual technical summary rept. no. 4
INNSBRUCK UNIV (AUSTRIA)
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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.
- Radiofrequency Wave Propagation