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Measurements and modeling of through-the-earth communications for coal mines.

Authors
Yan-L; Waynert-J; Sunderman-C
Source
2012 IEEE Industry Applications Society Annual Meeting: Forty-seventh IAS Annual Meeting, October 7-11, 2012, Las Vegas, Nevada. Piscataway, NJ: Institute of Electrical and Electronics Engineers, 2012 Oct; :1-6
NIOSHTIC No.
20041667
Abstract
This paper presents modeling results from National Institute for Occupational Safety and Health (NIOSH) research into through-the-earth (TTE) communications technology for underground coal mines. Research focuses on the factors controlling the propagation and coupling of radio signals between transmit and receive antennas separated by earth or coal. Most TTE sytems use single or multiturn loops of conductor for the transmit antenna. We compare the magnetic field distribution predicted from analytical formulas to the predictions of a method of moments computational electromagnetic (CEM) code. The predictions are compared in free space, in a homogeneous earth, and with the effect of the presence of the surface of the earth. The evaluations are done with the transmit loop buried in the earth and with the loop above the surface. The analytic results are shown to agree reasonablly well with the more detailed CEM predictions for the situations considered, reducing the need for expensive and complicated CEM codes in analyzing simple TTE configurations. The predictive methods are applied to TTE measurements made in 94 different coal mines by the Bureau of Mines in the 1970s and the impl
Keywords
Mining-industry; Underground-mining; Coal-mining; Electromagnetic-wave-transmission; Communication-systems; Radio-waves; Magnetic-fields; Electromagnetic-fields; Author Keywords: Loop Antenna; Mine communication; Magnetic Field Sensing; Through-the-Earth
Publication Date
20121007
Document Type
Conference/Symposia Proceedings
Email Address
LYan1@cdc.gov
Fiscal Year
2013
NTIS Accession No.
NTIS Price
Identifying No.
B20121218A
ISSN
0197-2618
NIOSH Division
OMSHR
Priority Area
Mining
Source Name
2012 IEEE Industry Applications Society Annual Meeting: Forty-seventh IAS Annual Meeting, October 7-11, 2012, Las Vegas, Nevada
State
PA; NV; NJ
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