Mining Publication: Development of a Through-the-Earth Monitor System
Original creation date: December 1980
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 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 one week's operation with interrogations every four hours.
Authors: Arthur D. Little, Inc.
- Analysis of Communication Systems in Coal Mines
- Assessment of Present Electromagnetic Techniques for the Location of Trapped Miners
- Basic Tutorial on Wireless Communication and Electronic Tracking: Technology Overview
- Communication Systems Research At Bruceton Safety Research Mine
- Experience with an Integrated, Computer-Controlled Communications and Monitoring System at the Robena Mine
- NIOSH-Sponsored Research in Through-the-Earth Communications for Mines: A Status Report
- Performance Evaluation of Electromagnetic Techniques for the Location of Trapped Miners
- Propagation of EM Signals in Underground Mines
- Through-The-Earth Wireless Real-Time Two-Way Voice Communications
- U.S. Bureau of Mines New Developments in Mine Communications