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Ordinary VLF/IB detectors have two coils head for sensing metal presence in soil. They use one of this coils, named TX coil, as a primary of a transformer, with a VLF sinusoidal frequency applied to it. Second coil, named RX coil, is connected to an amplifier and the two coils are either in induction balance relationship.
What above is obvious and well knowed.
But what physical quantities we can obtain and measure from this system to sensing and recognize metals buried in soil?
In order to design a metal detector system, for sure there are amplitude and phase shifting of RX signal that give us: metal sensing, metal and ground discriminations; but what also?
What above is obvious and well knowed.
But what physical quantities we can obtain and measure from this system to sensing and recognize metals buried in soil?
In order to design a metal detector system, for sure there are amplitude and phase shifting of RX signal that give us: metal sensing, metal and ground discriminations; but what also?