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Metal Detectors
General Metal Detector Discussion
PI and VLF combo detector
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<blockquote data-quote="loamer" data-source="post: 63181" data-attributes="member: 981"><p>Found these definitions - may explain the problem. </p><p></p><p><em>Very Low Frequency (VLF): a very low frequency metal detector, or VLF detector, features a search coil with an outer transmitting loop and an inner receiving loop. The receiver coil is shielded from the transmitter coil's magnetic field, but it detects the magnetic fields emanated by objects in the ground.</em></p><p></p><p><em>Pulse Induction (PI): pulse-induction metal detectors use the same coil(s) to both transmit and receive. A PI metal detector works by sending quick and powerful electrical pulses through its coil-usually about 100 pulses per second-each one creating a brief magnetic field. When a pulse ends, this field reverses polarity and collapses, causing a reflective pulse to run through the coil. If a conductive metal is present, the reflective pulse will take longer to disappear. PI metal detectors make excellent beach detectors because of their ability to ignore ground mineralization; ground minerals are poorer conductors than metals, and are thus less likely to interfere with the returning signal of a pulse-induction metal detector.</em></p></blockquote><p></p>
[QUOTE="loamer, post: 63181, member: 981"] Found these definitions - may explain the problem. [i]Very Low Frequency (VLF): a very low frequency metal detector, or VLF detector, features a search coil with an outer transmitting loop and an inner receiving loop. The receiver coil is shielded from the transmitter coil's magnetic field, but it detects the magnetic fields emanated by objects in the ground.[/i] [i]Pulse Induction (PI): pulse-induction metal detectors use the same coil(s) to both transmit and receive. A PI metal detector works by sending quick and powerful electrical pulses through its coil-usually about 100 pulses per second-each one creating a brief magnetic field. When a pulse ends, this field reverses polarity and collapses, causing a reflective pulse to run through the coil. If a conductive metal is present, the reflective pulse will take longer to disappear. PI metal detectors make excellent beach detectors because of their ability to ignore ground mineralization; ground minerals are poorer conductors than metals, and are thus less likely to interfere with the returning signal of a pulse-induction metal detector.[/i] [/QUOTE]
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Metal Detectors
General Metal Detector Discussion
PI and VLF combo detector
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