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- Equipment, tools, and parts:
- Through-the-earth communications systems
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- Reports of Investigations
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12/1/1983 - Reports of InvestigationsInformation on vertical magnetic noise in the voice frequency band, both within and above coal mines, is needed for the evaluation of through-the-earth baseband electromagnetic communications at mines where horizontal loop antennas are used. This report...
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1/1/1982 - Reports of InvestigationsThe Bureau of Mines (NIOSH Mining) has conducted field studies in coal mines throughout the United States to determine the effectiveness of electromagnetic techniques in locating miners trapped underground following a mine accident.
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1/1/1984 - Reports of InvestigationsElectromagnetic narrow-band signals were transmitted through the earth at 27 coal mines located throughout the United States. From those tests, apparent earth conductivity values were derived based upon a homogeneous half-space model of the earth.
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Content source: National Institute for Occupational Safety and Health, Mining Program