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Summary report of electromagnetic location techniques working group
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Published Date:
1973
Source:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 171-177Series:Language:English - File Format:
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Description:The Location Group conversed in the Petroleum Room of the Green Center with the purpose of addressing the following list of topics in light of the Bureau of Mines' requirements for detecting and locating trapped miners by electromagnetic methods. These topics include: Noise, Sources, Antennas (transmit and receive), the Propagation Medium, Signal Processing, Optimum Frequency, Receivers, Pulse vs. CW Techniques, Passive Location Techniques, and Obstacles. Practical constraints such as equipment size, weight and power requirements, cost and intrinsic safety were kept in mind during these discussions. It was emphasized that in-mine equipment must be inexpensive, rugged, simple and lightweight. Otherwise, the mine operators probably would not buy it nor would the miners be able to effectively use it. Present techniques for experimentally detecting and locating trapped miners were discussed, along with techniques to improve their location accuracy. Analytical, numerical, and scale modelling methods were considered as a means of giving further insight into measurement, anomalies caused by terrain variations, conductivity contrasts, and obstacles. After discussion of these topics, conclusions were drawn and existing problem areas were identified. These problem areas were addressed in developing guidelines for future efforts. Following the discussion period, the Chairman gave a summary of the Location Group report and comments were solicited from the entire group. 2.0 GROUP DISCUSSION HIGHLIGHTS 2.1 Noise W. Bensema asked the group whether the noise data provided by NBS was adequate. It was determined that for location systems analysis, the most important form of noise data was the frequency spectra of vertical and horizontal magnetic fields on the surface, and the answer to his question was affirmative. Drs. Wait and Frischknecht pointed out the difficulty in accurately measuring the true vertical magnetic field since these measurements are heavily influenced by the loop setting and the local geology. Nevertheless, these measurements are important since the same perturbations would also affect a receiving loop oriented to receive the vertical magnetic field.
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Main Document Checksum:urn:sha256:07c6a84dd990842000f8721ba372cd06df603e0459f724178297929c14340bb2
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Personal Author:Rankin, DavidConference Authors:Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)Published Date:1973Source:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 92-94Series:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of MinesDescription:Three -dimensional boundary value problems are difficult to solve. Indeed, while the separation of the scalar wave equation can be effected in 11 diff...
Personal Author:Jones, F. W.Conference Authors:Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)Published Date:1973Source:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 86-91Series: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:Farstad, Arnold J.Conference Authors:Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)Published Date:1973Source:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 62-72Series: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:Dolphin, Lambert ; Bollen, Robert ; ...Conference Authors:Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)Published Date:1973Source:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 168Series:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of MinesDescription:An electromagnetic sounder developed for an archaeological application in Egypt has been successfully tested in a California dolomite mine. Chambers i...
Personal Author:Fontaine, J. ; Demoulin, B. ; ...Conference Authors:Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)Published Date:1973Source:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 130-139Series:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of MinesDescription:To realize a radiowave communication along mine galleries a few kilometers long without repeater, we show that it is possible to use a coaxial cable b...
Personal Author:Parkinson, Howard E.Conference Authors:Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)Published Date:1973Source:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 1-8Series:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of MinesDescription:In 1969, new coal mine health and safety legislation was enacted in the United States. As a result of this legislation, the Department of Interior, Bu...
Personal Author:Wait, James R.Conference Authors:Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)Published Date:1973Source:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 9-14Series:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of MinesDescription:It is the purpose of this paper to review theoretical model concepts in through- the -earth transmission of electromagnetic waves. While the subject i...
Personal Author:Adams, John W.Conference Authors:Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)Published Date:1973Source:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 169Series: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. Each...
Personal Author:Gabillard, R. ; Dubus, J. P. ; ...Conference Authors:Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)Published Date:1973Source:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 121-129Series:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of MinesDescription:We present an electromagnetic method taken from the well known radiogoniometer that allows us to locate at the surface of the ground the vertical axis...
Personal Author:Emslie, Alfred G. ; Lagace, Robert L. ; ...Conference Authors:Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)Published Date:1973Source:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 38-48Series:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of MinesDescription:This paper is concerned with the theoretical study of UHF radio communication in coal mines, with particular reference to the rate of loss of signal s...
Personal Author:Roetter, Martyn F.Conference Authors:Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)Published Date:1973Source:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 202-217Series:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
Personal Author:Geyer, Richard G.Conference Authors:Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)Published Date:1973Source:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 20-33Series:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of MinesDescription:One aspect of a program to improve the chances of survival following coal mine disasters is the development of a communications system which will allo...
Personal Author:Delogne, P. ; Deryck, L. ; ...Conference Authors:Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)Published Date:1973Source:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 48-53Series:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of MinesDescription:So far as the propagation of electromagnetic waves is concerned, an underground tunnel behaves like a pipe or hollowed waveguide. Waves propagate in t...
Personal Author:Lewis, Richard L.Conference Authors:Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)Published Date:1973Source:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 98-103Series:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of MinesDescription:This is a discussion of the application of the zonal harmonic series to problems involving dipole sources in the vicinity of spherical boundaries. The...
Personal Author:Franceschetti, GiorgioConference Authors:Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)Published Date:1973Source:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 162-167Series:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of MinesDescription:Explicit expressions are presented for the input admittance and effective height of several buried metal antennas, namely: (i) prolate spheroidal; (ii...
Personal Author:Starkey, D. B.Conference Authors:Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)Published Date:1973Source:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 140-148Series: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:Bannister, Peter R. ; Williams, Frederick J. ; ...Conference Authors:Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)Published Date:1973Source:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 162-167Series:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of MinesDescription:During the last week in March and the first week in April, 1973, the Naval Underwater Systems Center measured the 76 Hz magnetic field strength (in Wi...
Personal Author:Goddard, Arthur E.Conference Authors:Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)Published Date:1973Source:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 54-61Series: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...
Personal Author:Hill, D. A. ; Wait, J. R. ;Conference Authors:Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)Published Date:1973Source:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 81-85Series:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of MinesDescription:The feasibility of locating a buried vertical magnetic dipole source (horizontal loop) from surface measurements of the vertical and horizontal magnet...
Personal Author:Moffatt, David L.Conference Authors:Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)Published Date:1973Source:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 112-120Series:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of MinesDescription:Considerable current interest is evident[l,2] in the use of transient electromagnetic methods for subsurface remote sensing. A transient method is dis...
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Personal Author:Rankin, DavidConference Authors:Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)Published Date:1973Source:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 92-94Series:Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of MinesDescription:Three -dimensional boundary value problems are difficult to solve. Indeed, while the separation of the scalar wave equation can be effected in 11 diff...
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