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Theoretical noise and propagation models for through-the-earth communication.

Authors
Hill-DA; Wait-JR
Source
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, :1-45
NIOSHTIC No.
10003392
Abstract
A survey of the literature on extremely low-frequency and very low- frequency atmospheric noise was made. Most measurements have concentrated on vertical electric field and the horizontal magnetic field rather than the vertical magnetic field, which is of interest in transmission between horizontal loops. The limited vertical magnetic field data indicate that the vertical component is generally 10 to 20 db below the horizontal component. Three laterally inhomogeneous earth models were analyzed for conversion of horizontal to vertical magnetic field. The rough surface model examines surface effects, the inhomogeneous thin sheet model treats volume effects, and the buried cylinder model treats localized manufactured effects. All three models predict the possibility of significant conversion from horizontal to vertical magnetic field. It was found that the predicted fields more nearly model the measured data than does the homogeneous half-space model.
Keywords
Noise-exposure; Noise-frequencies; Noise-pollution; Noise-protection; Noise-transmission; Noise-waves; Electrical-fields; Electrical-measurement; Electrical-waves; Magnetic-fields; Magnetic-properties; Miners; Mining-industry
Publication Date
19820101
Document Type
CP; Final Contract Report
Fiscal Year
1982
NTIS Accession No.
PB84-166628
NTIS Price
A05
Identifying No.
OFR-40-84
NIOSH Division
PRC
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines
State
CO; PA
Performing Organization
National Telecommunications and Information Administration
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