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Metal Detectors
General Metal Detector Discussion
How does a Metal Detector register the difference between ironstone and small pieces of steel
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<blockquote data-quote="XLOOX" data-source="post: 588637" data-attributes="member: 16174"><p>Bottom line - Iron is both magnetic & very conductive ( just not as conductive as more precious metals), ironstone is magnetic but not very conductive. </p><p></p><p>Regardless of whether VLF or PI ,your metal detector Transmit field produces tiny electric currents in high conductivity materials and these currents cause their own tiny electromagnetic fields a fraction of a second later that the detector Recieve coil picks up & the detector then identifies as metal.Beep !</p><p></p><p>In low conductivity materials there is nearly no current generated so the return fields are nearly too weak to be picked up at all but more importantly the timing of the return field from ground/ mineral is also different to that from a normal metal target ( very little delay for ground/minerals) so a good detector can still tell the difference.... up to a point.</p><p></p><p>There is another effect with VLF detectors and that is a highly magnetic mineral in the ground distorts the transmit field, which is then picked up by the recieve coil and unless it is a really good detector it will confuse it as the distorted transmit field is 1000x stronger than the return from a target.. This is why a PI is much better when lots of ironstone around.</p><p></p><p>PS Goldierocks that is the best info on ironstone gold relationship I have seen. It is a keeper in my permanent collection</p></blockquote><p></p>
[QUOTE="XLOOX, post: 588637, member: 16174"] Bottom line - Iron is both magnetic & very conductive ( just not as conductive as more precious metals), ironstone is magnetic but not very conductive. Regardless of whether VLF or PI ,your metal detector Transmit field produces tiny electric currents in high conductivity materials and these currents cause their own tiny electromagnetic fields a fraction of a second later that the detector Recieve coil picks up & the detector then identifies as metal.Beep ! In low conductivity materials there is nearly no current generated so the return fields are nearly too weak to be picked up at all but more importantly the timing of the return field from ground/ mineral is also different to that from a normal metal target ( very little delay for ground/minerals) so a good detector can still tell the difference.... up to a point. There is another effect with VLF detectors and that is a highly magnetic mineral in the ground distorts the transmit field, which is then picked up by the recieve coil and unless it is a really good detector it will confuse it as the distorted transmit field is 1000x stronger than the return from a target.. This is why a PI is much better when lots of ironstone around. PS Goldierocks that is the best info on ironstone gold relationship I have seen. It is a keeper in my permanent collection [/QUOTE]
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Metal Detectors
General Metal Detector Discussion
How does a Metal Detector register the difference between ironstone and small pieces of steel
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