How It Works
Rayleigh Backscatter Explained
Interrogator Unit
A single unit sends laser pulses down the fiber and analyzes returning backscatter for disturbance signatures.
Precision Location
Time-domain analysis pinpoints the disturbance to within a few meters along the cable run.
No Power at the Fence
Fully passive sensing cable requires no power or electronics along the perimeter itself.
Long-Range Coverage
A single interrogator can monitor tens of kilometers of fence line or buried cable.
Deployment
Fence-Mounted vs. Buried Deployment
Fence-Mounted
Cable clipped to chain-link or palisade fencing, detecting cutting and climbing vibration signatures.
Covert Buried
Cable buried just below grade for a concealed detection zone ahead of a wall or fence.
PSIM Correlation
Zone alarms auto-slew CCTV and log events in the PSIM alongside access control activity.
FAQ
Fiber Optic Perimeter Security - FAQ
How far can one fiber optic DAS system monitor?
A single interrogator unit can typically monitor several tens of kilometers of fiber, making it well suited to long, continuous perimeters such as pipeline corridors, industrial complexes, and large giga-project sites.
Does fiber optic DAS work in extreme heat and sandstorm conditions?
Yes. The fiber cable itself has no active electronics and is unaffected by heat, sand, or humidity; the interrogator equipment is installed in a climate-controlled equipment room, and detection algorithms are tuned to filter wind and blown-sand vibration patterns common across KSA.
Can DAS distinguish between a person climbing and an animal or vehicle?
Modern DAS systems use signature classification to differentiate between climbing, cutting, digging, and vehicle impact based on the distinct vibration pattern each activity produces, which reduces nuisance alarms compared to first-generation fiber sensors.
