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Development of a through-the-earth monitor system.
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, Contract H0177098, 1980 Dec; :1-29
The objective 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 band. The depth for through-the-earth transmission is expected at 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 through-the-earth monitor system are energized by mine power through a battery charger-storage battery power supply. In the event of mine power failure, the batter capacity is more than sufficient for 1 week's operation with interrogations every 4 hours.
Mining-industry; Mining-equipment; Monitors; Monitoring-systems; Mine-gases; Atmosphere-analyzers; Underground-mining
CP; Final Contract Report
NTIS Accession No.
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, Contract H0177098
Arthur D. Little, Inc.