Theoretical Noise and Propagation Models for Through-the-Earth Communication

Details

• Personal Author:
  Hill, David A. ; Wait, James R.
• Description:
  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. [Description provided by NIOSH]
• Subjects:
  Electricity Magnetic Fields Mining Noise Noise, Occupational Occupational Health Safety
• Keywords:
  Electrical-fields Electrical-measurement Electrical-waves Magnetic-fields Magnetic-properties Miners Mining-industry Noise-exposure Noise-frequencies Noise-pollution Noise-protection Noise-transmission Noise-waves

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• Series:
  Mining Publications
• Subseries:
  Open File Report
• Document Type:
  Text
• Genre:
  Conference Publications ; Final Contract Report
• Place as Subject:
  Colorado ; OSHA Region 3 ; OSHA Region 8 ; Pennsylvania
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  PRC - Pittsburgh Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-45
• NIOSHTIC Number:
  nn:10003392
• NTIS Accession Number:
  PB84-166628
• Citation:
  Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, :1-45
• Federal Fiscal Year:
  1982
• Performing Organization:
  National Telecommunications and Information Administration
• Peer Reviewed:
  False
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:8d8c400a931affb2d2ac2c2724bd00fe5a0c5670e968d14f52f836686f2634c24fc6b826958e64b651e02205d7f30f63380ae7a9595aabbbdefe3b9e2223f2b2
• Download URL:
  https://stacks.cdc.gov/view/cdc/206696/cdc_206696_DS1.pdf
• File Type:
  [PDF - 894.99 KB ]