AgilFence
 
 
 
 
 
Benefits   Key Features   Applications
         

AgilFence-A is a distributed acoustic sensing system to record real-time sound signals along the entire length of the pipeline continuously without any blind points and interferences. It can monitor every points of the pipeline, locate the leakage and the third party intrusion event accurately, and identify the nature of the third party intrusion event. After analysing the sound signals (frequency, amplitude, and phase) received from the optical fibre, an alarm will be triggered if the event is a threat to the pipeline.

 
   
No blind zones along the entire length of the pipeline
Continuous interference-free monitoring
Define the nature of intrusion
Early warning to the threat to the
pipeline
No maintenance required
Easy deployment
 
   
Gas pipeline leakage detection
Third Party Intrusion (TPI)
Well integrity
Pipeline Inspection Gauge (PIG) Tracking
Seismic monitoring

 

 

How it works

   
 

The AgilFence-A buried solution uses Phase-Sensitive Optical Time Domain Reflectometer (PS-OTDR) technology to achieve distributed acoustic sensing along an optical fibre cable up to 20 km. When a coherent laser pulse is launched into the fibre, the Rayleigh backscattering will occur. This backscattering received will be analysed by the AgilFence Sensing Unit and AgilFence Signal Processing Unit. By detecting temporary changes in frequency, amplitude and/or phase, AgilFence can pick up vibration or acoustic signals caused by excavation activities. As the distance the light travelled can be easily calculated from the time of travelling, the excavation activities can be located accurately. With intelligent signal processing, false alarm will be eliminated and true alarm will be triggered and displayed to the user.

 

On-site Testing Results

A trial was conducted along a busy road in Singapore. A fibre optic sensor cable has been buried underground 90 cm in depth to evaluate the system performance. A jackhammer was used to hit on the road (picture below) to simulate an excavation event.

 

Tests were conducted to determine the sensitivity of the buried fibre optic sensing cable and the spatial resolution for excavation events. Figure 1 shows the relative positions of the excavation points and the sensor cable distance (starting at 0 m and ending at 50 m in a loop).

S/N Test Scenarios Location Detect? 25 m spatial resolution? Remarks
1 Hammer head at B hitting cable
position 0 m and 50 m concurrently
B Y N.A. 50 m spatial resolution achieved
2 Hammer head at D hitting cable position 12.5 m and 37.5 m concurrently D Y Y 25 m spatial resolution achieved
3 Hammer head at B and F hitting cable position 0 m, 25 m and 50 m concurrently B & F Y Y 50 m spatial resolution achieved
Table: Summary of Trial Results

For this trial, a detection is considered successful if the buried sensor cable can detect the excavation activity. A spatial resolution of 25 m is considered achieved if two detections spaced no more than 25 m apart are separately reported. The table above shows the results.

 
Brochure Download
 
AgilFence A Fibre Optic Acoustic Sensing System for Pipeline & Buried Cable Protection (Spanish)

AgilFence A Fibre Optic Acoustic Sensing System for Pipeline & Buried Cable Protection (Russian)

AgilFence A Fibre Optic Acoustic Sensing System for Pipeline & Buried Cable Protection (Chinese)

AgilFence A Fibre Optic Acoustic Sensing System for Pipeline & Buried Cable Protection (English)

 
 
 
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