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Summary report of uplink and downlink communications working groupĀ
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1973
Source: Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 178-201 -
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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 Mines; four systems for providing operational/emergency communications on the working sections of coal mines, indeed up to the very face of the section. The systems are: uplink-data, downlink-voice, sidelink-call alert coded page, sidelink-roof bolt voice page. Each of these systems makes use of the mine overburden as the signal transmission medium, as opposed to the guiding wires, cables, and tunnels treated by the operational communications working group. Each of these systems satisfies one or more of the Bureau's objectives for mine communications systems; namely ⢠reliable links for monitoring the mine environment under both operational and emergency conditions. ⢠reliable links for communicating with miners during emergencies. ⢠special links for increasing the efficiency of day-to-day operations of the mine. Each of these systems has been successfully demonstrated on a limited experimental basis, and prototypes of all these systems are installed and operating in the USBM experimental mine in Bruceton, Pa. Each of these systems must now be optimized regarding its performance, and engineered for practical routine application to the working sections of actual operating coal mines, particularly those of the room and pillar type. This optimization and engineering must take place subject to the principal constraints listed by Howard E. Parkinson in his Workshop paper entitled, "Objectives and Constraints of Through-the-Earth Electromagnetic Communications Systems'' and enumerated below. ⢠Depth of Mine Overburden ⢠Overburden Conductivity ⢠Electromagnetic Noise In and Above Mines ⢠Limited In-Mine Electrical Energy (Stationary or Man Carried) During an Emergency ⢠Intrinsic Safety for In-Mine Equipment ⢠Practical and Rugged Equipment for Use Under Both operational/Emergency conditions ⢠Severe Weight Limitations for Man Carried Equipment ⢠Reasonably Low Costs Especially for Man Carried Equipment Part II of this paper provides a brief description of each system, while Part III summarizes the present status of developments related to these systems and some recommendations for future work needed to advance these systems to the practical application stage.
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The perturbation of alternating electromagnetic fields by three-dimensional bodiesCitePersonal 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. Each...Personal Author:Franceschetti, Giorgio1973 | 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...Objectives and constraints of through-the-earth electromagnetic communication systemsCitePersonal Author:Parkinson, Howard E.1973 | 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...Feasibility of a radiocommunication in mine galleries by means of a coaxial cable having a high coupling impedanceCitePersonal Author:Fontaine, J. ;Demoulin, B....1973 | 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:Evans, J. E. ;Griffiths, A. S.1973 | Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of MinesDescription:Noise processing experiments with ELF (3 to 300 Hz) atmospheric noise and signals in the 40 to 80 Hz range are described. The primary purpose of the e...Theory and experiments relating to electromagnetic fields of buried sources with consequences to communication and locationCitePersonal Author:Geyer, Richard G.1973 | 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:Farstad, Arnold J.1973 | Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of MinesDescription: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 Bur...Use of the zonal harmonic series for obtaining numerical solutions to electromagnetic boundary value problemsCitePersonal Author:Lewis, Richard L.1973 | 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...A discussion on the three-dimensional boundary value problem for electromagnetic fieldsCitePersonal Author:Rankin, David1973 | 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:Emslie, Alfred G. ;Lagace, Robert L....1973 | 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:Kanda, M. ;Adams, J.W.1973 | Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of MinesDescription:A system for measuring amplitude probability distributions (APDās) of electromagnetic noise in coal mines is described and typical APDās from an u...Personal Author:Hill, D. A. ;Wait, J. R.1973 | 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:Bannister, Peter R. ;Williams, Frederick J....1973 | 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...Electromagnetic survey method applicable to underground quarries; proceedings of thru-the-earth electromagnetics workshopCitePersonal Author:Gabillard, R. ;Dubus, J. P....1973 | 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:Moffatt, David L.1973 | 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...Personal Author:Howard, Allen Q., Jr.1973 | Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of MinesDescription:An approximate solution to the electromagnetic boundary value problem consisting of a horizontal cylindrical conductor buried in a lossy half-space an...Personal Author:Olsen, R. G. ;Farstad, A. J.1973 | Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of MinesDescription:The Coal Mine Health and Safety Act of 1969, passed by Congress in the wake of the disaster at Farmington, West Virginia, led to an extensive study by...Personal Author:Dolphin, Lambert ;Bollen, Robert...1973 | 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:Bensema, W. D. ;Adams, J. W.1973 | Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of MinesDescription:A portable, multichannel battery-operated mine-permissible measurement system was developed to measure the rms magnetic-field noise spectrum in the fr...
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The perturbation of alternating electromagnetic fields by three-dimensional bodies
Cite
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...
Personal Author:
Adams, John W.
1973 | Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
Description:
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...
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