Extremely Low Frequency Seismic Communicator
(aka ELF-Thumper)
We have developed an underground
transmitter and portable topside receiver that allow trapped miners to
communicate topside. When activated, the transmitter continually
transduces a signal into the ground as seismic energy. The receiver
collects and processes the ground signal. The presence of a valid
signal indicates survivors, and the frequency of the signal indicates
their position. The system has been tested in the Natural Bridge
Caverns and in 15 seconds can provide a strong signal through over
200' of rock.
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