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Idiomas disponibles
Idiomas disponibles
How Detectors Work
Metal detectors create an electromagnetic eld which penetrates the
ground. Metal objects cause a change to this eld because they conduct
electricity. The detector senses this change and sends a signal back to
the control unit, alerting the operator.
Basic Principles
Metal detectors work by transmitting an electromagnetic eld from the search coil into
the ground. Any metal objects (targets) within this electromagnetic eld will become
energised, creating their own circular electric currents (eddy currents) and transmit an
electromagnetic eld of their own. The detector's search coil senses this receive signal
and alerts the user by producing a target response. GF-650 metal detectors are also
capable of discriminating (or di erentiating) between di erent target types and can be
set to ignore unwanted targets.
1. Battery (Inside handle)
The battery provides power to the detector
2. Control Unit
This is where the transmit signal is
generated and the receive signal is
processed and converted into a target
response.
3. Search Coil
The detector's search coil transmits the
electromagnetic eld into the ground and
receives the return electromagnetic eld
from a target.
4. Transmit Electromagnetic Field (blue)
The transmit (Tx) electromagnetic eld
energises targets to enable them to be
detected.
5. Target
A target is any metal object that can
be detected by a metal detector. In this
example the detected target is treasure,
which is a good (accepted) target.
6. Unwanted Targets
A target is any metal object that can
be detected by a metal detector. In this
example the detected target is treasure,
which is a good (accepted) target.
7. Receive Electromagnetic Field
(yellow)
The receive (Rx) electromagnetic eld is
generated from energised targets and is
received by the search coil.
8. Target Response (green)
When a good (accepted) target is detected
the metal detector will produce an audible
response, such as a beep or a change
in tone, and a visual display of target
information will be shown on the screen.
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