[Tigera (OP)]

Hi Guys,
There is a lots of machines on web called Long Range Locator (LRL) or MFD.

Like 'RayFinder' from ''Image Locators'' .

or 'PDF-1000' from "Fitzgerald's" .


"The concept behind which the LRL was developed is the use of FERF's, or Free Electron Radiation Fields. All buried precious metals suffer a slight deterioration due to acid rain, snow and other chemicals. When acid and ultra high radiation contacts metals, a free electron radiation field is created. The longer an object is buried the stronger the field".
Some calls it "Resonance".

The basic units,have a signal generator and also an antenna to transmit signals.A pairs of L-Rods use as an Receiver antenna. the user(operator) walk around the transmitter while Holding L-Rods in hands. when L-Rods cross, it's sign of probable target.

any way......Does any one know any thing about Free Electron Radiation Field (FERF) or Resonance ??

I think they are talking about electromagnetic resonance!?!


Regars

[Bored chemist]

I think they are talking about electromagnetic resonance!?!

I think they are talking nonsense.

[evan_au]

when L-Rods cross, it's sign of probable target.

This sounds like old-fashioned dowsing rods.
I saw one experiment where practitioners tried to discover underground pipes that had water in them (or not).
They were no better than random chance.

See: https://en.wikipedia.org/wiki/Dowsing#Rods

Does any one know any thing about Free Electron Radiation Field (FERF) or Resonance ??

There are electron resonance effects similar to the common Nuclear Magnetic Resonance Imaging often used in hospitals (NMR machines).

For a practical-strength superconducting magnet, the frequency of these electron resonances are much higher than the frequencies used in NMR (by a factor of a thousand or so). This is not far beyond the frequencies used in modern cellular mobile transmitters, so there may be more interest developing in this technology.

Of course, today's helium-cooled superconducting magnets are not practical for a piece of portable equipment to be used on the beach.
See: https://en.wikipedia.org/wiki/Electron_paramagnetic_resonance

I suggest that you stick with the magnetic and inductive effects of your more usual metal detector, which also uses electronic effects.