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Use of the zonal harmonic series for obtaining numerical solutions to electromagnetic boundary value problems
  • Published Date:
    1973
  • Source:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 98-103
  • Language:
    English
Filetype[PDF-522.62 KB]


Details:
  • Supporting Files:
    No Additional Files
    1. Subsurface applications of periodic electromagnetic video pulse signals 
      Personal Author:
      Moffatt, David L.
      Conference Author:
      Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
      Published:
      1973
      Source:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 112-120
      Series:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
      Description:
      Considerable current interest is evident[l,2] in the use of transient electromagnetic methods for subsurface remote sensing. A transient method is discussed which uses a periodic video-type pulse containing a wide frequency range. A video pulse is us...
      File Type:
      Filetype[PDF - 354.63 KB]
    2. Performance of manpack electromagnetic location equipment in trapped miner location tests
      Personal Author:
      Farstad, Arnold J.
      Conference Author:
      Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
      Published:
      1973
      Source:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 62-72
      Series:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
      Description:
      The use of radio signals for underground communications was considered as early as the mid-1920's [1] - [4] . However, early experiments did not produce promising results with the type of equipment that was available then [5] . With advancements in s...
      File Type:
      Filetype[PDF - 1010.41 KB]
    3. Summary report of operational communications working group
      Personal Author:
      Roetter, Martyn F.
      Conference Author:
      Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
      Published:
      1973
      Source:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 202-217
      Series:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
      File Type:
      Filetype[PDF - 640.36 KB]
    4. The electromagnetic response of a buried sphere for buried dipole excitation 
      Personal Author:
      Hill, D. A.; Wait, J. R.;
      Conference Author:
      Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
      Published:
      1973
      Source:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 81-85
      Series:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
      Description:
      The feasibility of locating a buried vertical magnetic dipole source (horizontal loop) from surface measurements of the vertical and horizontal magnetic field components has been investigated by Wait (1971). , For sufficiently low frequencies, the ma...
      File Type:
      Filetype[PDF - 186.51 KB]
    5. Fields of a magnetic dipole excited buried cylinder
      Personal Author:
      Howard, Allen Q., Jr.
      Conference Author:
      Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
      Published:
      1973
      Source:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 73-80
      Series:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
      Description:
      An approximate solution to the electromagnetic boundary value problem consisting of a horizontal cylindrical conductor buried in a lossy half-space and excited by an arbitrarily oriented magnetic dipole is found using an iterative perturbation techni...
      File Type:
      Filetype[PDF - 234.53 KB]
    6. A discussion on the three-dimensional boundary value problem for electromagnetic fields
      Personal Author:
      Rankin, David
      Conference Author:
      Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
      Published:
      1973
      Source:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 92-94
      Series:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
      Description:
      Three -dimensional boundary value problems are difficult to solve. Indeed, while the separation of the scalar wave equation can be effected in 11 different coordinate systems, an analytic solution requires that the boundaries, both external and inter...
      File Type:
      Filetype[PDF - 123.86 KB]
    7. Reply to: "A Discussion on the three-dimensional boundary value problem for electromagnetic field" by D. Rankin
      Personal Author:
      Jones, F. W.
      Conference Author:
      Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
      Published:
      1973
      Source:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 95-97
      Series:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
      Description:
      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. As stated in my paper, the equation to solve (in e. m.u. ) is: [ ] where n2 =4 ??? . This may be re...
      File Type:
      Filetype[PDF - 100.72 KB]
    8. The perturbation of alternating electromagnetic fields by three-dimensional bodies
      Personal Author:
      Jones, F. W.
      Conference Author:
      Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
      Published:
      1973
      Source:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 86-91
      Series:
      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 conducting half -space which consists of regions of different conductivities. A numerical method is use...
      File Type:
      Filetype[PDF - 143.65 KB]
    9. Summary report of uplink and downlink communications working group 
      Personal Author:
      Lagace, Robert L.
      Conference Author:
      Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
      Published:
      1973
      Source:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 178-201
      Series:
      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 Mines; four systems for providing operational/emergency communications on the working sections of coal ...
      File Type:
      Filetype[PDF - 1.14 MB]
    10. Theory of the propagation of UHF radio waves in coal mine tunnels
      Personal Author:
      Emslie, Alfred G.; Lagace, Robert L.; Strong, Peter F.;
      Conference Author:
      Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
      Published:
      1973
      Source:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 38-48
      Series:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
      Description:
      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 strength along a tunnel, and from one tunnel to another around a comer. Of prime interest are the nat...
      File Type:
      Filetype[PDF - 500.48 KB]
    11. Summary report of electromagnetic location techniques working group 
      Personal Author:
      Farstad, Arnold J.
      Conference Author:
      Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
      Published:
      1973
      Source:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 171-177
      Series:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
      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. The...
      File Type:
      Filetype[PDF - 288.74 KB]
    12. Guided propagation of radio waves
      Personal Author:
      Delogne, P.; Deryck, L.; Liegeois, R.;
      Conference Author:
      Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
      Published:
      1973
      Source:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 48-53
      Series:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
      Description:
      So far as the propagation of electromagnetic waves is concerned, an underground tunnel behaves like a pipe or hollowed waveguide. Waves propagate in this tunnel with a low attenuation only if their frequency is higher than a so-called critical freque...
      File Type:
      Filetype[PDF - 193.64 KB]
    13. Radio propagation measurements in coal mines at UHF and VLF
      Personal Author:
      Goddard, Arthur E.
      Conference Author:
      Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
      Published:
      1973
      Source:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 54-61
      Series:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
      Description:
      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 intra-mine paths. The basic experimental parameters included frequency, polarization, path orientatio...
      File Type:
      Filetype[PDF - 346.24 KB]
    14. Electromagnetic field solutions for infinite and finite cables for conducting half-space models- both frequency - and time-domain
      Personal Author:
      Hill, D. A.
      Conference Author:
      Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
      Published:
      1973
      Source:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 15-19
      Series:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
      Description:
      Introduction The fields of an infinite line source in the presence of a conducting half-space have been examined by Wait and Spies (1971). In any real communication link using a current-carrying cable for the transmitting antenna, the cable is of fin...
      File Type:
      Filetype[PDF - 104.72 KB]
    15. Electromagnetic direction finding experiments for location of trapped miners
      Personal Author:
      Olsen, R. G.; Farstad, A. J.;
      Conference Author:
      Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
      Published:
      1973
      Source:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 34-37
      Series:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
      Description:
      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 the National Academy of Engineering of the problems involved in coal mine safety. One of the result...
      File Type:
      Filetype[PDF - 129.98 KB]
    16. Summary report on electromagnetic noise measurement program
      Personal Author:
      Adams, John W.
      Conference Author:
      Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
      Published:
      1973
      Source:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 169
      Series:
      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 mine uses different types of equipment. In addition, some surface measurements of noise have been m...
      File Type:
      Filetype[PDF - 37.61 KB]
    17. Objectives and constraints of through-the-earth electromagnetic communication systems
      Personal Author:
      Parkinson, Howard E.
      Conference Author:
      Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
      Published:
      1973
      Source:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 1-8
      Series:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
      Description:
      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, Bureau of Mines has carried out communications research aimed at developing whole mine communications ...
      File Type:
      Filetype[PDF - 502.00 KB]
    18. Theory and experiments relating to electromagnetic fields of buried sources with consequences to communication and location
      Personal Author:
      Geyer, Richard G.
      Conference Author:
      Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
      Published:
      1973
      Source:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 20-33
      Series:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
      Description:
      One aspect of a program to improve the chances of survival following coal mine disasters is the development of a communications system which will allow surviving miners to make their circumstances known to rescue teams. Various communications techniq...
      File Type:
      Filetype[PDF - 370.87 KB]
    19. State of knowledge of analytical techniques for thru-the-earth electromagnetic wave problems relevant to mine rescue
      Personal Author:
      Wait, James R.
      Conference Author:
      Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
      Published:
      1973
      Source:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 9-14
      Series:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
      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 ...
      File Type:
      Filetype[PDF - 232.46 KB]
    20. Experimental comparison of buried and elevated ELF transmitting antennas
      Personal Author:
      Bannister, Peter R.; Williams, Frederick J.; Katan, J. Robert; Ball, John R.;
      Conference Author:
      Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
      Published:
      1973
      Source:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 162-167
      Series:
      Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
      Description:
      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 Wisconsin and Texas) produced by both the elevated and (newly installed) buried Wisconsin Test Facilit...
      File Type:
      Filetype[PDF - 249.63 KB]
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