Perimeter Security
Description: Video Motion Detection (VMD) sensors operate
through almost any good quality CCTV camera providing both a detection
of activity & observation of the events progress.
The VMD sensor system monitors changes in the camera's field of
view and if a change occurs through an intruder entering the scene an
alarm condition is generated.
Better systems also include an image tracking feature which can
monitor a number of separate intruders simultaneously by drawing a
different coloured line around each of them and leaving a trail line
of where they have been.
Classification: Passive - Overt or Covert - Line of Sight
Application: Excellent addition to other detection systems
and for covering large or difficult areas. Ideally used with both
overt & covert cameras
Advantages: Can be used with existing cameras without
additional field wiring, can cover a wide field of view, helps guards
track an intruder even in low light conditions and removes the
intruder's ability to hide, relatively low cost, easy to maintain
Possible Causes of Nuisance Alarms: Severe adverse weather,
large animals, flocks of birds, blown debris, movement of camera
Methods of Defeat: Tunnelling, blind spots, very slow movement,
attack on or the blinding of camera.
Description: The 'microstrain' fibre optic sensor is a new
and advanced in-ground or fence mounted detection system utilising a
multi core fibre. The system can detect minute vibrations even from
sounds, via deflections in the laser beam.
By using advanced signal processing and analysis the different
causes of vibration can be identified and those attributable to false
alarms, eliminated.
Classification: Passive - Covert - Terrain Following
Application: Sited at approx 10cm below the surface of the
ground the system provides for relatively quick installation with very
high probability of detection and extremely low incidents of false alarms.
Where soft ground exists the fibre should be laid in gravel.
Advantages: High detection characteristics, very low false
alarm issues if correctly set up, exceptionally long distances between
transmitters 65Km, pinpoint detection (to less than 50m), spare cores
in fibre can carry additional data signals from other equipment and also
video signals from CCTV cameras, relatively easy to install.
Possible Causes of Nuisance Alarms: Virtually nil if correctly
set up other than land slip or heavy snow.
Methods of Defeat: Very deep tunnelling or bridging, not
effective in deep snow.
Description: Microphonic fence disturbance sensors utilise
signals generated by the minute flexing of triboelectric coaxial sensor
cable, which are analysed by powerful signal processors to detect the
sounds associated with cutting, lifting or climbing the fence fabric.
The systems can also incorporate a special audio channel which enables
guards to 'listen in' to activity along each zone of the fence
Classification: Passive - Overt - Terrain Following
Application: For protection of existing fences & structures
against climbing, lifting or cutting. The cable is attached by means
of special cable ties at 30cm intervals. They can also be fitted to
coiled razor wire fences.
Advantages: Quick and simple to install, relatively inexpensive,
zone lengths up to 350m, immune to EMI & RFI, high probability of detection,
adaptive algorithms virtually eliminate environmental nuisance alarms,
audio 'listen in' capability.
Possible Causes of Nuisance Alarms: Extreme weather, contact
by large animals, badly maintained fences, overgrown vegetation.
Methods of Defeat: Tunnelling or bridging.
Intrusion Detection Grid
Description:Intrusion Detection Grids are an effective, electro-optical intrusion detection grid
for such openings as water pipes, windows, canals, etc. It is fully
operative in a wide range of temperatures, even when completely
submerged under water for many years.
Intrusion Detection Grids replace conventional physical barriers, while enhancing
protective capability. Any attempt to cut or remove a part of the
grid, or the grid itself, is immediately detected by MAGBAR's
opto-mechanical mechanism embedded and sealed in a galvanized
profile (stainless steel optional).
A unique, outstanding Detection Grid feature is that any attempt to even
bend one of the grid bars is immediately detected.
Classification: Physical Barrier
Application: Water pipes, Air Ducts, Windows, Canals etc.
Advantages: Can be operated as a Totally Submerged System, Requires no maintenance.
Possible Causes of Nuisance Alarms: Large Flotsum in Waterways hitting the Detection Grid.
Methods of Defeat: Tunnelling or bridging.
The above list is not exhaustive but an example of available
systems and any one or more such technologies may be employed in
order to create the required level of protection.
For example:
A site may be protected by an acoustic vibration sensitive detection
cable fitted to the perimeter fence which will detect attempted
intrusion by lifting, cutting or climbing the fence. Beyond the fence
a microwave or infra-red barrier is installed to detect any deeper
intrusion together with a concealed 'buried cable' disturbance detection
system providing a 3rd level of protection which is both invisible and
very difficult to evade.
All of the above would be integrated in to a master alarm control
so that the progress of any intrusion could be monitored and a CCTV
system designed so as to automatically 'home in' on areas of intrusion
and track the intruders accordingly.
Westminster are able to provide guidance on any aspect of perimeter
or border security from the simple to the most complex of requirements
and work within the most hostile of environments.
To download our 8 page full colour Westminster International
Perimeter Brochure right click on image and
select "save target as" - please be patient (2mb file) can take 10
minutes on a 56.6 kbps connection.
The Westminster International Perimeter Brochure is in portable document
format (PDF).
 Previous 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.
|
