A VLF or very low frequency detector usually has two coils one to transmit the other to recieve. There comes a time when too much power is applied to the transmit coil that problems occur and instabiblity sets in.
A Pulse induction machine only has one coil normally and high currents can be applied to this when in a transmit mode creating a nuge magnetic field. Any metal in the ground is therefore detected at much deeper depths when a target is located by the same coil which now acts as a reciever. This is only a very brief reply without going into technical details.
If you want a more detailed account why dont you google it and see what you find there are plenty of reports around if you look.
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