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Mining Publication: One-Way Fire Warning Alarm System for Underground Mines
Keywords: Antennas Fire alarms Through-the-earth communications systems Underground mining
This page is archived for historical purposes and is no longer being maintained or updated. Contact NIOSH Mining if you need an accessible version.
Original creation date: July 1990
Authors: KE Hjelmstad, MA Ackerson
Conference Paper - July 1990
Download PDF Document (0.32 MB)
The Tenth WVU International Mining Electrotechnology Conference, Morgantown, West Virginia, July 24-27, 1990; :47-52
An ideal fire warning alarm system for underground mines would be low cost, convenient, fast, reliable, and able to warn all underground workers. Present warning systems, such as phones, messengers, and stench, fail one or more of these criteria. The U.S. Bureau of Mines may have devised the ideal system. The one way communication system employs a large loop antenna and transmitter to create a 630 hertz (Hz) electromagnetic field to send information through-the-earth to cap lamp battery mounted micro-receivers worn by underground miners. Field tests of prototype equipment in 1986 resulted in through-the-rock signal transmission of over 762 m (2500 ft). Subsequent hardware upgrades for more recent tests resulted in transmissions of over one mile. Recently developed receiver circuitry employs phase-locked-loop detection circuitry responsive only to a specific series of pulses of given time duration, that eliminates false alarms from electromagnetic noise emitted by mine equipment, power lines, or lightning. A multichannel system can relay standard messages to miners.
Image of publication One-Way Fire Warning Alarm System for Underground MinesConference Paper - July 1990
Download PDF Document (0.32 MB)
The Tenth WVU International Mining Electrotechnology Conference, Morgantown, West Virginia, July 24-27, 1990; :47-52
See Also
Assessment of Present Electromagnetic Techniques for the Location of Trapped Miners
Basic Tutorial on Wireless Communication and Electronic Tracking: Technology Overview
Propagation of EM Signals in Underground Mines
Recent National Institute for Occupational Safety and Health Research Using Ground Penetrating Radar for Detection of Mine Voids
Refuge Alternatives in Underground Coal Mines
The Status of Mine Fire Research in the United States
Technology News 551 - Through-the-Earth, Post-Accident Communications - an Emerging Technology - TN-No. 551
Through-the-Earth Communication Antenna Feasibility Demonstration
Through-the-earth Communications Technologies Available
Ultra-Low Frequency Through-the-Earth Communication Technology
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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