The WG Buried Fibre Cable Long Perimeter Detection System uses a buried fibre optic cable and a centrally-located Sensor Unit to provide covert detection of intruders, vehicles, and tunnelling for a perimeter length of up to 72 km (45 mi).
No powered or conductive items are required in the field, making the sensor completely immune to EMI and lightning and impossible to detect through electronic means.
How it Works
The system works by transmitting pulses of laser light into a single-mode optical fibre and accurately measuring the minute light reflections that occur along its length. A disturbance of the fibre caused by ground vibrations changes the amount of light returned from that point.
The systems reflectometry-based technology does not require the light to traverse the full length of cable. If a cable is cut, it retains the ability to detect and locate instructions up to the point of the cut, thus enabling the system to support cut-immune configurations.