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TEKNETICS
HOW METAL DETECTORS WORK
Most hobby metal detectors use VLF Induction Balance technology. Here's how they work.
The searchcoil (also called search head or loop) contains two electrical induction coils which
are like antennas. One coil transmits a rapidly alternating magnetic field, illuminating the region
surrounding the searchcoil. If metal is present, its electrical conductivity distorts the magnetic
field. If iron metal is present, its magnetism also distorts the magnetic field, but in a different
way, allowing the metal detector to distinguish between ferrous and nonferrous metals.
The other coil is a receiving antenna which detects changes in the magnetic field caused by
the presence of metal. Electronic circuits amplify this weak signal, analyze it to determine the
changes which occur as the searchcoil sweeps over the target, and then convey the
information to the user in the form of a visual display or audio tones. Most modern metal
detectors perform many of these tasks in software running on an internal microcomputer.
The iron minerals which are present in most soils also distort the magnetic field, obscuring the
weak signals of small or deep objects. This can cause the object to go undetected, or to be
misidentified when it is detected. Much of the technology that goes into modern metal
detectors is devoted to the task of eliminating the unwanted signals from iron minerals in the
soil, while not losing the signals from metal objects.
TREASURE HUNTER'S CODE OF ETHICS:
• Always check Federal, State, County and local laws before searching.
• Respect private property and do not enter private property without the
owner's permission.
• Take care to refill all holes and leave no damage.
• Remove and dispose of any and all trash and litter found.
• Appreciate and protect our inheritance of natural resources, wildlife and
private property.
• Act as an ambassador for the hobby, use thoughtfulness, consideration
and courtesy at all times.
• Never destroy historical or archaeological treasures.
• All treasure hunters may be judged by the example you set; always
conduct yourself with courtesy and consideration of others
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Comprehensive Operating Manual & Guide to Metal Detecting
Copyright© First Texas Product, L.L.C.
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