Further clarification
J-Player, yes the telemetry is the way to go via an RF link. Jim,that's an unknown at this point and would have to be determined through experiments in the field. Obviously the larger the object the farther it could be detected. Something like a coin I wouldn't imagine it could be detected very far unless as J-Player pointed out you used a high powered Generator to really inject some serious current into the ground to give you the larger response from the object.
In the book "Applied Geophysics" by Telford,Geldart and Sheriff,on pg.585 he describes the typical generator used with Induced Polarization (the sytem we're discussing)is 1KV to 10KVA and more. He goes on to say the larger units put out 1-5amps and up to 5,000 volts. That would certainly give a very strong response on even the smaller targets. Kinda not to portable. He does mention portable units that are in the 100W range with reduced range.
This would definately be fun to experiment with! Now we're talking some real range.
Randy
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