Excellant J Player!
You put alot of work into that explanation and drawings. Yes that would make for an interesting metal detector. I wonder if you could get anymore information by looking at the spectrum of the earth currents. what I envision is an untuned ferrite coil antenna mounted inside a u shaped faraday shield with the open side facing the earth to shield it from the spark discharge. You'd have to have it somewhat away from the spark but would be interesting in the frequency domain.
Randy
|