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Disclaimer....I have little to no knowledge of mining....so
this is more of a question.
The idea is to develop a small device to be carried by miners.
When it is placed against the rock face, it generates a
vibration (or sound) at the optimal frequency to be carried by
rock. This way, if
a miner is trapped, he could communicate
with the surface via morse code. This device should also be
able to receive and amplify said vibrations (or sound)
It seems that tapping is the best way to search for trapped
miners, so it would seem a logical step to automate/improve
on this tapping.
Teenager Invents Cave Texting Underground Low Frequency Radio
[Spacecoyote, Apr 05 2010]
||" I'll just signal my location by creating an earthquake - they can trace me by the fallen debris " ;-)
||Normzone...I am thinking more along the lines of tapping on a rock, not earthqauke starting strength
||Sorry, bad signal-to-noise ratio likely. With the
reverberations a long-wall mine excavator
makes, I don't think the tapping is going to be heard.
||The various veins and impurities would have
different resonant frequencies and therefore make it
very difficult to communicate an intelligible signal