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State of knowledge of analytical techniques for thru-the-earth electromagnetic wave problems relevant to mine rescue
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1973
Source: Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 9-14 -
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Description:It is the purpose of this paper to review theoretical model concepts in through- the -earth transmission of electromagnetic waves. While the subject is very broad in its defined scope, we will be conscious of the specific applications to mine rescue and emergency telecommunications in coal mine environments. The plan of the paper is to outline previous theoretical efforts without attempting to attach names or organizations to the specific developments. However, we include a guide to the literature as an appendix. Without pretending to be entirely impartial we include a critique of the limitations of the available analytical models. As I see it the central problem is to calculate the steady state mutual impedance of a four-terminal network that is the black box characterizing the through-the-earth path. Problems of secondary importance include the determination of the input impedances of the two pairs of terminals and the associated transient responses.
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Main Document Checksum:urn:sha256:559067ed7a937c5bc71087a0cd416a1033d7f838170ba497364cb416241ee5a6
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Personal Author:Lagace, Robert L.1973 | Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of MinesDescription:The attention of this group was focussed on four through-the-earth communication systems that are presently of high interest to the U.S. Bureau of Min...Personal Author:Jones, F. W.1973 | Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of MinesDescription:The perturbation of alternating electromagnetic fields by three-dimensional structures is considered. The general model is that of a semi-infinite con...Personal Author:Adams, John W.1973 | Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of MinesDescription:The present status of the National Bureau of Standards program is that many magnetic tapes of analog data have been recorded in four major mines. 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W.1973 | Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of MinesDescription:I do not regard the criticism by Rankin of my work as valid or even meaningful. I strongly reject the assertion by Rankin that my results are invalid....Personal Author:Starkey, D. B.1973 | Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of MinesDescription:nvestigation into the expressions of the field produced by a loop over a conducting half space or in an infinite conducting half space are well docume...Personal Author:Farstad, Arnold J.1973 | Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of MinesDescription:The use of radio signals for underground communications was considered as early as the mid-1920's [1] - [4] . However, early experiments did not produ...Personal Author:Goddard, Arthur E.1973 | Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of MinesDescription:Radio propagation measurements were conducted in a coal mine at UHF (200 to 1000 MHz) and VLF (1 to 50 kHz) to characterize the transmission loss of i...
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Personal Author:
Lagace, Robert L.
1973 | Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
Description:
The attention of this group was focussed on four through-the-earth communication systems that are presently of high interest to the U.S. Bureau of Min...
Personal Author:
Jones, F. W.
1973 | Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
Description:
The perturbation of alternating electromagnetic fields by three-dimensional structures is considered. The general model is that of a semi-infinite con...
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