Magnetic Field Strength Mapping of the Helvetia Coal Co. Lucerne #8 Mine at Medium Frequency

Details

• Journal Article:
  Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, Contract No. P0372716
• Personal Author:
  Cory, Terry S.
• Description:
  This report describes magnetic field measurements in the Helvetia Coal Co. Lucerne No. 8 Mine for purposes of deriving a mapping of the magnetic field strength covering the major haulageways which contain conductors. The results of the testing at medium frequency show that coverage of the entire mine area containing conductors can be achieved employing wireless radio techniques whereby radio signals are coupled into and are carried by these conductors. These results confirm earlier qualitative testing of the Collins Mine Wireless Radios in this mine. These results, performed over the frequency range 71-2890 kHz, illustrate the effect of frequency on the radio propagation with the conclusion that the best overall coverage is obtained at frequencies approximating 1000 kHz. This report presents all the raw data and the reduced data in the form of magnetic field strength contour maps. Sufficient information is provided to enable independent reduction of the data. A summary of observations which can be made directly from the contour maps is given. [Description provided by NIOSH]
• Subjects:
  Electromagnetic Phenomena Mining Occupational Health Radiation Radio Waves Safety
• Keywords:
  Mining-industry; Electromagnetic-energy; Electromagnetic-fields; Electromagnetic-interference; Electromagnetic-radiation; Underground-mining; Radio-waves
• Source:
  Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, Contract No. P0372716, 1977 Sep; :1-28
• Series:
  Mining Publications
• Document Type:
  Text
• Funding:
  U.S. Bureau of Mines purchase orde. P0372716
• Genre:
  Final Contract Report
• Place as Subject:
  Iowa ; OSHA Region 3 ; OSHA Region 7 ; 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:
  32 pdf pages
• NIOSHTIC Number:
  nn:20030898
• Federal Fiscal Year:
  1977
• Peer Reviewed:
  False
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:306fd506905016f0245af6d8c37d4b26e6d62d4295c3829f30991d16336b0ad8a09434db6bf3749a8f272e6c847a0d7a90c124696d5d43a10d8c94c6a658b1ea
• Download URL:
  https://stacks.cdc.gov/view/cdc/9156/cdc_9156_DS1.pdf
• File Type:
  [PDF - 568.15 KB ]