Method to test PI depth

[wyndham]

I remember Wirechief asking once about the signal from a PI into the ground and how much the ground dampens the signal and how far the signal reaches, at least this is what I believe was being discussed some time ago on several forums.
Hat if we were to make small coils of different # of wire wraps, extend the leads to a meter and bury these coils at different depths in a controlled volume of earth. The coil might be as small as a dia of a pencil or other sizes
the purpose is to find out the true signal strenth of a PI MD by the induced voltage from each of the coils. The advantage I see is that this might give a standard to work from instead of a nugget response that has to create the eddy current then the response back to the coil.
Eric was looking into the magnetic suceptability of different soils.This would show the absorption(possibly) of these soils.
Maybe this is already being done by ML or Eric or others and I am not aware of this. But this might help homebrew "See" the output signal better.
Any thoughts, Wyndham

[Max]

I remember Wirechief asking once about the signal from a PI into the ground and how much the ground dampens the signal and how far the signal reaches, at least this is what I believe was being discussed some time ago on several forums.
Hat if we were to make small coils of different # of wire wraps, extend the leads to a meter and bury these coils at different depths in a controlled volume of earth. The coil might be as small as a dia of a pencil or other sizes
the purpose is to find out the true signal strenth of a PI MD by the induced voltage from each of the coils. The advantage I see is that this might give a standard to work from instead of a nugget response that has to create the eddy current then the response back to the coil.
Eric was looking into the magnetic suceptability of different soils.This would show the absorption(possibly) of these soils.
Maybe this is already being done by ML or Eric or others and I am not aware of this. But this might help homebrew "See" the output signal better.
Any thoughts, Wyndham

Hi,
seems a really good idea. Think that problems could be related to external meters connections (prevent oxidation) and also soil type. I think could be useful to test that way to create a good model of soil EM field interactions.
I know that there are models out there e.g. for viscosity effects but what you mentioned goes to the point here...how a real PI md signal interacts with soil and what are e.g. attenuation, viscosity effects and their effects on target masking too.
Like in the old Corbyn's article this is a good issue in PI design...but too often misunderstud or considered just only an unrelevant side effect.
Keep going with some tests if you can...would be interesting.
I'd like to do too similar stuff...but,unfortunately, at the moment I'm too busy with work for MD testing !


Best regards,
Max

[wyndham]

A little farth along this line would be to create a standard baseline. maybe silica sand or some soil that would be close to or a ratio of what signal one would get from a similar coil in air at the same distance. Or to find either a linear or other slope for size vs soil or other variables.
My first thought would be to wrap some litz wire around a pencil at different turns and play around with the idea til some pattern emerges.
Thanks for the comments Max, Wyndham