Andy Rowland Head of Propositions BT Global Services January 2010 IRSE Seminar - Fibre Acoustic Monitoring.
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Andy Rowland Head of Propositions
BT Global Services
January 2010
IRSE Seminar - Fibre Acoustic Monitoring
Business Applications
Copper Cable Theft
Train Tracking
TOA for Level Crossings
Bridge Collision Warning
Proof of Attendance
Points Monitoring
Flat Wheel Detection
Damage to networks
Integrity Monitoring
Distributed Acoustic Sensing using Fibre
Coherent Light Coherent Phase-Modulated Light
Stress Force Caused by Acoustic Wave
Strain
The fibre is the sensor
Standard multi- or single-mode optical fibre
1m pulse of light
Backscattered light provides
measurement point every 1m
T9,999
T9,998T9,997
T9,996
T9,995
T1 T2 T3 T4 ……….
Measurements all along a 10km fibre = 10,000 sensors!!
How the Fibre Sensor Works
Classification of Sounds
Detect event exceeds threshold
Use Geo-Fence to exclude legitimate activity
Use algorithms to classify sounds – based on self organizing neural networks, also known as Kohonen Maps.
Examples of classification:
Trains
Cable handling
Lifting of lids
Walking on track ballast
Evolution of Fibre Sensing
Lid On
Tap
Van Horn
Resilience Test with Jet Engine
Lid Off
Initial Tests with UK Water Company
BT Engineers Tracing Fibre Underground
Initial Testing with Rail
Commuter train leaving on welded rail approaching viaduct crossing the
viaduct, then crossing points.
Sound file of express train possibly crossing a point
or rail gap.
1.6m20m
If train speed is ≈144km/hr or 40m/sec then the following distances apply
Train length is 8 carriages + engine
12m
182m
1.5m over 50km
Initial Implementation for Rail – Copper Cable Theft
Major Operational delays as a result of stolen Infrastructure
Increased delay minutes
Millions of Pounds lost by replacement of stolen Copper Cable
Punitive penalties relating to operational delays
Substantive resource tied up in preventative operations
Safety implications both passengers and trackside
BT detected and logged CCT activity on 5th Sep
21.46. Alarm raised.
Theft preparation activity detected 6-Sept at 21.57.
Alarm raised.
Theft preparation activity detected 7-Sept at 21.57.
Alarm raised.
Theft activity events detected 8-Sept 04:30.
Large number of events logged between 4:30 and
6:30.
Cable cut event 6:34. Client detected signal and power
failure at 6:40
BT detected cable being removed from site till 7:04
direction of travel away from level crossing Last theft activity detected at 7.21.
Client onsite activity detected commencing at
08:40. Client called BTP at 8:55 to report theft.
Client & BTP activity logged until 10:40.onsite
CCT Portal View
Collaborative Innovation – Level Crossing Monitoring
Visibility of trains actual positions, speed and direction to signal box staff independently of signalling system infrastructure
Countdown predictions in real-time of The ‘Time Of Arrival’ (TOA) at User Worker Crossing (UWC)
Timing gaps between trains arriving User Worker Crossing (UWC)
Categorize train movement predictions by train type Express, local, freight
Detection of stopped trains location
Categorize train arrivals based on route
Categorize train arrivals based service identity and timetable information
Track Tracking and Level Crossing Monitoring
Distance
Tim
e
Speed
Meters
Seconds
Cha
nge
in s
peed
= a
ccel
erat
ion
Cable reel12.75-13.00
Direction – to sensor
Direct
ion-
from
Sen
sor
Level Crossing
T1
T2
T3
T5
T4
ToA 4ToA 3
ToA 5
ToA 2
Sensor
Key Differentiators
Technology
We use two world class sensing technologies
Competitors can provide specific elements only BT can provide an end to end
solution
BT can provide 11 different sensor technologies, to help eliminate false positives
World class GIS mapping to provide accurate location of problem
Highly developed classification software to identify accurately incidents
Protected by multiple Patents
Credibility & Experience
BT has one of the biggest fibre network in the world as part of it’s 21CN
programme
We have the only deployment working in a hostile trackside environment, covering
24 sensors and 504km.
Our current rail customer is sufficiently pleased with the solution that we are now
being pressed to add additional applications.
Offices worldwide
Telecommunications services described are subject to availability and may be modified from time to time. Services and equipment
are provided subject to British Telecommunications plc's respective standard conditions of contract. Nothing in this publication
forms any part of any contract.
© British Telecommunications plc 2010
Thank you
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