Quote:
Originally Posted by J_Player
Hmmmm... What have we here?
It seems you are presuming that Esteban's detector works on the principle of detecting eddy currents generated by a metal detector search coil. But wait...
Esteban said his treasure detector detects via magnetic absorption, not by detecting induced eddy currents. I am sure any EE will tell you it is not practical to detect induced eddy currents from a long distance, but what do these EEs know about detecting magnetic absorption anomalies?
In the case of Esteban's proposed magnetic absorption detector, there are more forces at work than just the absorption of magnetism. It is presumed that long-time buried non-ferrous objects are capable of developing other physical properties in the surrounding soil due to dissolved traces of metal which change the soil composition enough to produce anomalies that can me measured at a greater distance than an eddy current detector.
It has been well documented by scientists all over the world that long time buried metals including gold will dissolve and actually form a column of ions that move upwards toward the surface of the soil. These ions are in-effect part of a ground battery as long as they remain as ions, and are capable of interacting with not only the magnetic properties of the ground, but also the electrostatic properties of the air in the local area where the metal is buried.
Now, knowing that Esteban's detector does not work on the principle of detecting induced eddy currents, how can you prove it doesn't work? The only method I know to prove whether it works is to watch it succeed or fail at finding long time buried non-ferrous metals.
Best wishes,
J_P
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I have designed a apparatus wich monitoring ambient. In place with high conductivity (include cartridge of brass) the apparatus can't center well the target but demonstrates (for this apparatus) how "infernal" (for this antenna based apparatus) can be the electric field. Lead only is detectable when you are over the target with short beeps. Round objects better, include stainless-steel coin, but at short distance. When you walk the antenna is affected in front and laterals, not very directional it is, and I can comprobe that this apparatus can detect the conductive item near a car! So imagine you the magnitude of the field for this antenna milivoltmeter + equalizer (or comparator) + amplifier + beep generator.
Regards
Esteban