A metal detector is an electronic device to detect hidden
metal objects. There are different kinds and models of metal detectors, but
most common are the hand held and walk through detectors.
Walk through metal detectors
Walk through metal detectors are used for security screening
at access points to detect secret metal weapons on a person's body.
How Do Metal Detectors Work?
This is done by pulse induction (PI) method. Pulse induction
is accomplished by having two coils on each side of the detector – one coil is
a transmitter coil and the other one is a receiver coil. When power is applied
to these two coils a magnetic field is created between the two panels. The
detection of a risky object is notified with an alarm.
Are Metal Detectors Safe?
Most of the walk through metal detectors runs at a very low
frequency that is far out of the danger zone. Cell phones and computer monitors
are more dangerous than a metal detector.
The Advantages of Metal Detectors
With a hand held detector, security staffs can detect if a
person is carrying a metallic object. Walk through metal detectors are
much quicker. They alert the security personnel of dangerous objects such as
knives or weapons.
Metal detectors are helpful to deter potential criminals
because the criminal will think twice before walking through a security check
point.
The Disadvantages of Metal Detectors
Metal detectors generate electromagnetic fields. This can cause electrical interference
to medical devices such as pacemakers.
In various situations, metal detectors may provide a false
alarm if people are wearing some kind of jewelry, watch, phone etc.
What are the typical locations and uses for a walk
through metal detector?
Today walk through detectors are available in a variety of
locations including:
- Public and private buildings,
- corporate work places,
- police stations,
- schools,
- manufacturing facilities,
- warehouses,
- nuclear facilities,
- transportation terminals,
- courthouses,
- historical landmarks,
- sporting events,
- concerts / live programs.
Walk through metal detectors are easy to Setup:
Modern security walk through detectors are very easy to
setup and operate. Each unit comes with a detailed manual. Digital electronics
are easily adjusted. The walk through metal detectors comes with factory preset
programs. It can be adjusted for your specific location or the type of object
that you are looking to detect. Based on the level of sensitivity that you
choose, the detector can be adjusted to find various targets.
Operating a walk through metal detector:
Controlling the flow of traffic is important once metal
detectors are installed. You need to ensure that all individuals who enter or leave
the building are heading for the detector. It is a good idea to have a basket
or tray setup next to the metal detector for individuals to place any metal
objects in to. It is essential that coins, keys, belts,watches and other metal
objects are taken away before walking through the detector.
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