How the metal detector works
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It's basically just a mutual inductance tester.
Of course, you only have the L1 coil to test off of, but the L2 (the piece of metal), thanks to mutual inductance, will increase the inductance visible from the source.
The picture shows coils, but really only the detector head uses a coil. The secondary L2 doesn't have to be a coil. An uncoiled wire has a certain amount of inductance, as does a metal sheet or a metal ball or any other metal. If you induce a current on it, there will be magnetic flux around it and it is therefore an inductor.
They get more sophisticated, including the use of a third coil as a magnetometer, using pulse-echo signal processing schemes, using a pair of balanced inductors that would become unbalanced at the introduction of a mutual inductance, but all in all they're just better ways of detecting when the inductance of the detector coil changes due to mutual inductance.
i get the answer friends , hope it help u
it is good answer
It's basically just a mutual inductance tester.
Of course, you only have the L1 coil to test off of, but the L2 (the piece of metal), thanks to mutual inductance, will increase the inductance visible from the source.
The picture shows coils, but really only the detector head uses a coil. The secondary L2 doesn't have to be a coil. An uncoiled wire has a certain amount of inductance, as does a metal sheet or a metal ball or any other metal. If you induce a current on it, there will be magnetic flux around it and it is therefore an inductor.
They get more sophisticated, including the use of a third coil as a magnetometer, using pulse-echo signal processing schemes, using a pair of balanced inductors that would become unbalanced at the introduction of a mutual inductance, but all in all they're just better ways of detecting when the inductance of the detector coil changes due to mutual inductance.
i get the answer friends , hope it help u
it is good answer
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