New FiberPatrol Buried PIDS to Detect Intruders, Vehicles & Tunneling

Senstar, the world’s largest manufacturer of perimeter intrusion detection systems (PIDS), unveils FiberPatrol for buried perimeter detection applications.

Using a buried fiber optic cable and a centrally-located sensor unit, FiberPatrol provides covert detection of intruders, vehicles, and tunneling for up to 72 km (45 mi) per processor.


“The advanced technology behind FiberPatrol has been protecting critical infrastructure around the world for many years as a fence-mounted intrusion detection solution,” said Product Manager Stewart Dewar.

Stewart Dewar, Senstar Product Manager

“Engineered for buried applications, including pipeline protection, we can now provide the same reliable and accurate detecting and locating abilities, with intruders not even aware they are being monitored.”

“These buried detection capabilities further broaden Senstar’s market-leading portfolio of perimeter intrusion detection products.”

FiberPatrol detects and locates a wide range of above and below ground threats associated with long perimeters including borders.

From someone walking, running or crawling above the sensor, to heavy vehicle engine vibrations, to digging and tunneling activities, FiberPatrol pinpoints intrusion attempts to within ±10 m (±33 ft) accuracy.

Intruder detection

When an intruder moves across the ground above the FiberPatrol sensor cable, whether walking, running, or crawling, characteristic vibrations are created.

The system distinguishes these from background vibrations, and declares an alarm.

Senstar FiberPatrol
Intruder and vehicle detection

FiberPatrol technology not only detects soil compression and displacement in the vicinity of the buried fiber sensor cable but also the minute seismic wave induced by human footsteps.

The high sensitivity of FiberPatrol provides flexibility in the burial depth of the sensor cable, enabling the system to not only detect footsteps directly above the sensor cable, but also those up to several meters away.

Vehicle detection

FiberPatrol’s advanced algorithms enable vehicles moving in the vicinity of the sensor cable to be detected and their location and speed determined.

FiberPatrol can be configured to detect heavy vehicle engine noise, raise alarms if vehicles are detected, ignore vehicles if traffic is expected, or raise an alarm only if a vehicle stops suddenly within a configured distance.

Digging and tunneling detection

FiberPatrol detects hand and machine digging and tunneling at distances of up to 20 m (66 ft) from the sensor cable in any direction.

The sensor cable can be positioned several meters underground if necessary to extend coverage down to the required depth.

Activities inside an existing tunnel such as movement of people, equipment, and vehicles can also be detected.

FiberPatrol requires no powered or conductive items in the field, making the sensor completely immune to EMI and lightning and intrinsically safe in the presence of explosive atmospheres.

Senstar FiberPatrol
Sample installation in which buried FiberPatrol sensor works in conjunction with fence-mounted sensor


FiberPatrol works by transmitting pulses of laser light into a single-mode optical fiber and accurately measuring the minute light reflections that occur along its length.

A disturbance of the fiber caused by ground vibrations changes the amount of light returned from that point.

FiberPatrol’s reflectometry-based technology does not require the light to traverse the full length of cable.

If a cable is cut, FiberPatrol retains the ability to detect and locate instructions up to the point of the cut, thus enabling the system to support cut-immune configurations.

FiberPatrol can accurately detect and locate intrusions even when there are multiple simultaneous intrusions or in the presence of spatially-distributed environmental noise that would mask the detection capability of other long-range fiber optic sensors.

As well, the system’s resilient design allows detection to continue right up to the point of a cut in the sensor cable.

Senstar FiberPatrol
Using a buried fiber optic cable and a centrally-located Sensor Unit, FiberPatrol’s advanced technology provides covert
detection of intruders, vehicles, and tunneling for up to 72 km (45 mi).


  • Invisible and undetectable fiber optic buried sensor
  • Detect and locate a wide range of intrusion types:
    • Walking, running, or crawling intruders
    • Surface digging, manual and machine
    • Moving vehicles
    • Heavy vehicle engine running
    • Tunneling activities
    • Intruder or equipment movement within tunnels
  • Sensor cable length up to 72 km (45 mi) per Sensor Unit
  • Pinpoint intrusion locations with a ±10 m (±33 ft) accuracy
  • Accurately locate multiple simultaneous intrusion events
  • Sensor cable continues to operate up to the point of a cut
  • No electronics, outdoor power, communication infrastructure, or grounding points required in the field
  • EMI and lightning immune
  • Software-configurable detection zones
  • Easy-to-understand configuration software
  • Multiple options for integration with SMS, VMS and PSIM platforms
  • Alarms reported by zone number, cable distance and/or GPS coordinates
  • High Probability of detection (Pd) and low Nuisance Alarm Rate (NAR)

(Learn More about FiberPatrol Ranging Fiber Optic Intrusion Detection Sensor for Fences, Wall and Buried Pipelines. Courtesy of SenStar Corporation and YouTube)

FiberPatrol for buried applications is ideal as a standalone protection option or as an additional layer of protection for a fence line.

For buried pipeline applications, check out FiberPatrol®-PL.

Senstar has been manufacturing, selling and supporting the world’s largest portfolio of perimeter intrusion detection sensor technologies for 35 years.

Senstar is also a leading provider of personal duress solutions. Senstar products can be found around the world in more than 80 countries, in tens of thousands of sites including borders, ports, military and government, oil and gas, correctional, and other critical sites.