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Development of a through-the-earth monitor system
  • Published Date:
    December 1980
  • Language:
Filetype[PDF-1.06 MB]

  • Corporate Authors:
    Arthur D. Little, Inc. ; United States. Bureau of Mines. Division of Minerals Health and Safety Technology. ; Pittsburgh Research Center (U.S.)
  • Description:
    The object of this program was to design and build a self-contained system for remote monitoring of the atmosphere in mines. The system developed uses the mine pager phone line as the primary communication channel and also has the capability of using 208 Hz in the ELF band for wireless transmission through the earth. The depth for through-the-earth transmission is expected to be about 80 to 90 meters in high conductivity soil and is limited by the noise level in the ELF band-pass filters. The underground components of the TEM System are energized by mine power through a battery charger-storage battery power supply. In the event of mine power failure the battery capacity is more than sufficient for 1 week's operation with interrogations every 4 hours.

    Minerals research contract report performed by Arthur D. Little, Inc. under Performed under contract H0177098.

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