Evaluation of a signaling and warning system for underground mines
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Evaluation of a signaling and warning system for underground mines

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  • Description:
    "A wireless signaling and warning system applicable to both coal and noncoal underground mines was evaluated. A TeleMagnetic Signalling Systems wireless ultra low frequency electromagnetic signaling system was installed at an experimental mine site at Lake Lynn laboratory, Pennsylvania. The system used a transmitter and antenna system which produced a low frequency electromagnetic field with a programmable carrier output frequency of about 2 to 3 kilohertz. A commercial smoke sensor was interfaced to a remote portable transmitter, and the alarm of the sensor was used to trigger the central evacuation and paging transmitter system during experimental mine fires. The underground/surface receivers flashed cap lamps and activated remote devices, such as strobe lights, within 30 to 40 seconds after the encoded signal was received. Evaluation results showed full mine coverage of the electromagnetic field and the encoded signal was received at the farthest point underground and on the surface perimeter. The cost of a signaling and warning system such as the one installed at the experimental laboratory was about 20,000 dollars." - NIOSHTIC-2
  • Content Notes:
    Also available via the World Wide Web. Includes bibliographical references (p. 15-16).
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