Using the Theremin's circuit to detect electric charged find-spots

[Funfinder]

First you have to read the operating principles here:

https://en.wikipedia.org/wiki/Theremin


This stuff might shines some light onto certain detectors which maybe able to locate
"ground batteries" which is the same as the "capacitor-effect" also the Theremin uses.

The on the ground standing treasure-hunter builts together with the floor and device
some LC-circuit (inductance-capacitance / coil-capacitor) and now is the question
how sensitive the device has to be and how carefully someone must "slide" (walk)
over the area (perhaps this only works with wet grass?), so the search-coil picks
up some "charged ground" and we are not talking about high-voltage electro-static
but just some pretty weak changes around the 0,05-1 DC volt range.
(comparable with something like the potato-battery)

The metal object together with enough acid containing or sour soil might create an
electric interaction - but just perhaps ... Not insulated shoes also would be needed
so the electricity will establish a good enough flow.

[kosacid]

i don't know how good radio frequency's are at penetrating ground but it should work but i think power lines will be a nightmare ( if it dosent you can always be a backup at a halkwind concert )

[Davor]

And grass as well.
I've seen a demo with a theremin was used to identify a special ball among many, but I think in real nature you'll go bonkers far sooner than you'd find anything.

[Funfinder]

The good news is that now we have some scientific approach concerning some
of these LRLs or LRL-users who claim they are detecting gold-ions, ground-batteries
or because of long buried stuff especially charged ground-spots.
Perhaps it's even better or unavoidable to hold the detection coil 1,5m above the surface
so the danger is minimized to get some kind of "shortcut" of the coil with the ground.

And - for additional info:
Batteries and capacitors are different:
In short:
primary cell (= usual) batteries: using chemicals which can't get reverted to "collect electricity" again
akkumulators: the chemistry inside is able to collect electricity again (rechargeable)
capacitors: electricity is collected between the plus and minus poles (electrolyte, dielectric materials)

But I doubt that any finds create any voltage inside the soil and if so it would be directly a shortcut
or the minus pole would be the ground itself while plus is the find but this potential is surrounded by
the ground and can't get out of there and also creates no voltage above the surface.
The only thing what is created is some sort of electrolytic movement of metal-ions into the
surrounding soil if the metal corrodes easily in there (loam, salt, swamp)

The much better explanation why some of these wannabe LRLs "seems to work somehow"
is that those are some kind of handheld-magnetometers which react on the earth-magnetic-
field-lines together or mixed up with larger distortions of that, caused by larger metal-objects
or changing mineralic conditions deep below the soil.


btw.
The most simple solution to find out if such a Theremin works to detect something would be:

Taking it to some site and before adjusting it to some fixed pitch and volume.
And now crawling over the ground while holding the device closely over it !!!!
If the sound changes there might be a treasure below, but only just might be!