Perimeter Security
The level of protection afforded to any given building or area is
normally determined by the level of risk from intrusion or other criminal
activity and ideally will comprise of several different but complimentary
'layers' of protection.
In this respect Perimeter Protection, in its various forms, is the
ideal 1st level of protection providing both an early warning of
attempted intrusion as well as deterring / delaying entry of intruders.
Perimeter Protection is applied to the boundary of the property,
be it the external fabric of the building or the boundary fence line
in open or border areas. Most situations would benefit from incorporating a
Westminster Perimeter Protection System, in addition to any other
security measures involved but for high risk and sensitive areas such
as airports, military establishments, international borders, power stations, governmental
establishments, nuclear power plants, oil & gas refineries, research
establishments, embassies, residential establishments of individuals
at risk from kidnap or assassination, banks, industrial plants etc,
the installation of adequate perimeter security is vital.
In addition Perimeter Security can be applied to areas posing a
safety risk to unauthorized persons such as water treatment plants,
building sites, firing ranges, mining areas etc. and in such cases
Perimeter Protection can be used to provide an early warning of
intrusion or trespass and to instigate an alarm or audible safety
message warning etc.
Westminster can advise, design, supply and install suitable
Perimeter Protection and border Security Systems worldwide including:
Description: Microwave sensors are motion detection devices
that flood an area with an electronic field. Any movement in the zone
disturbs the field and sets off an alarm.
There are two basic types of microwave sensors: Monostatic
sensors, which have the transmitter and receiver encased within a
single housing unit, and Bistatic sensors, in which the transmitter
and receiver are two separate units
Classification: Active - Overt - Line of Sight
Application: Bistatic units provide high security, long range
volumetric protection to flat areas - Monostatic units provide isolated,
rapid deployment protection & can be used to guard against overhead
intrusion
Advantages: Large area (up to 500m), volumetric protection,
difficult to determine area of protection, quick to deploy.
Possible Causes of Nuisance Alarms: External electrical fields
(radio transmitters etc.) or magnetic fields (large electric motors or
generators etc.), moving objects and debris, movement of mounting posts.
Methods of Defeat: Slow rate of movement, blind spots, tunnelling or bridging.
Description: Passive infrared sensors detect electromagnetic
radiated energy generated by external sources, particularly the thermal
energy emitted by people in the Far infrared range.
Active infrared sensors generate a multiple beam pattern of modulated
infrared energy and react to a change in the modulation of the frequency,
or an interruption in the received energy.
Classification: Active / Passive - Overt - Line of Sight
Application: Can be used to provide secondary levels of
protection or to cover gateways & openings etc., isolated local alarm
cover to vulnerable areas, triggers for CCTV Cameras etc. Often wired
in multi beam configuration for more reliable operation.
Advantages: Low cost, easy to deploy & maintain.
Possible Causes of Nuisance Alarms: Overgrown vegetation,
fog, heavy rain, snow, sand storms, moving objects, animals, birds and
debris, movement of mounting posts, severe temperature changes.
Methods of Defeat: Blind Spots, tunnelling or bridging.
Description: Electrostatic field disturbance sensors generate
an electrostatic field between/around an array of wire conductors.
Sensors in the system detect changes or distortion in this field.
This can be caused by anyone approaching or touching the fence.
Classification: Active - Overt - Terrain Following
Application: Electrostatic field disturbance sensors are
mounted on freestanding posts or chain link fences. All the wires
are mounted parallel to each other and to the ground, thereby achieving
uniform sensitivity along the fence length. Special springs are used at
the connectors to ensure excessive wind vibrations do not cause false
alarms.
Advantages: Highly resilient to wind and ambient noise, low
maintenance, can be mounted on fences, walls & roofs, high probability
of detection.
Possible Causes of Nuisance Alarms: Anything causing excessive
fence vibration such as extreme weather, birds, and animals, overgrown
vegetation.
Methods of Defeat: Tunnelling or bridging over the fence.
Next Page
To view our Perimeter Protection PDF please click here.
To view our related Infra-Red Beam Product as a PDF please click Infra-Red Photo-Electric Beam.
To view our related Covert Below-ground System as a PDF please click Westminster Covert Below-ground Security System.
For more information - please click here to contact us.
|
