A mine boundary, a pipeline, a rail corridor or a buried cable route can run for tens of kilometres. Conventional detection assumes power, network and equipment spaced along the line — which on a route that long is unaffordable to install, impossible to maintain, and in South Africa very likely to be stolen before it ever raises an alarm.
The problem
Some perimeters are too long to guard and too long to wire.
The cable is the sensor
A laser pulse travels down a standard fibre optic cable and a fraction of the light scatters back. Vibration anywhere along that fibre changes the returning signal. The system reads those changes continuously, so the cable itself becomes a detector along every metre of its length.
Digging, footsteps, vehicles, tampering
Ground disturbance has a signature. Someone digging above a buried cable, a vehicle stopping where none should, a person walking a fence line, a hand on the cable itself — each reads differently, and the system is trained to tell them apart from wind, rain and passing traffic.
It tells you the point on the line
A detection is not just an alarm on a long route, it is a position along it. That turns a thirty-kilometre problem into a coordinate a response team can drive to.
No power, no electronics on the line
All the intelligence sits in one unit at the end of the fibre. Along the route there is only passive glass — nothing energised, nothing worth taking, nothing to maintain. On a South African cable route, that is the whole argument.
Where it fits
Long, linear, and otherwise indefensible.
DAS is specialised and it is not the answer for a warehouse yard. It earns its place where the asset is linear and long: buried power and telecoms cable routes, fuel and water pipelines, rail corridors, mine boundaries and conservation fence lines that run beyond the reach of cameras and radar. It also works alongside what you already have — a DAS detection can cue a camera, a radar or a response team to the exact point on the line, so the long-range layer and the visual layer do different jobs rather than competing.
What we do
Two platforms, and an honest recommendation.
Kevlar Risk has access to two DAS platforms and specifies between them on the route, the asset and what you actually need to detect. This is genuinely specialised technology: the design work matters more than the brand, and a poorly configured DAS system produces either silence or noise. We would rather walk the route with you than quote from a drawing.
Book a free site assessment.
Tell us about your site and we will come back within one business day. No obligation, no pressure.