Hawk Measurement Systems Smart Sensor Technology for Gas
Pipeline Monitoring
Slide 2
Fibre Optic Distributed Sensor (FOS) The optical fibre cable is
the sensor: The multiple core Fibre To The Home (FTTH) cable can be
used as a distributed acoustic and strain sensor. The standard
loose tube telecommunication fibre cable could be used as a
temperature sensor.
Slide 3
The optical fibre cable is the sensor: FOS Ideal design
integrates loose tube fibre (for temperature sensing), tight
buffered fibre (for strain and acoustic sensing) and adhesive tape
together in one cable, so it could stick to flat surface. Sheath
Loose tube Optical fibre Adhesive tape
Slide 4
Distributed Acoustic Sensor (DAS) Position (m) Intensity (a.u.)
Leak sound signal location Time (ms) Intensity (a.u.) Leak sound
waveform Detect leak position Detect leak hole size
Slide 5
DAS Third party interference detection: Position (m) Intensity
(a.u.) Sound signal location Time (ms) Intensity (a.u.) Sound
waveform
Slide 6
Performance Specifications for DAS Maximum fibre length50 km
Spatial Resolution0.5 m Location accuracyWithin 5 m or better
Identify activities Gas leak, Gas pressure and leak hole size,
digging, normal vehicle, human and animal passing etc. Acoustic
wave bandwidth0 20 kHz distance pending Real time detectionYes Two
channel detection to minimize signal fadingYes Tolerance to single
cable fault*Yes Fault Detection / ReportingProgrammable fault
alarms and reports Sensor Life Time>30 years Operating
temperature range Control unit: +5 O C to +60 O C Optical fibre
cable: -30 O C to +70 O C Control unit size4U 19 rack enclosure
Operating Voltage 90 250 Vac 9-30 Vdc Power consumption
Performance Specifications for DTS Maximum fibre length50 km
Spatial Resolution0.5 m Location accuracyWithin 5 m or better
Temperature Resolution 0.1 C Temperature Accuracy 0.1 C Signal
Averaging1 to 16,000,000 Data collection time 1 to 30 seconds,
dependent on distance, accuracy and interrogation method. Fault
Detection / ReportingProgrammable fault alarms and reports Sensor
Life Time>30 years Operating temperature range Control unit: +5
O C to +60 O C Optical fibre cable: -30 O C to +70 O C Control unit
size4U 19 rack enclosure Operating Voltage 90 250 Vac 9-30 Vdc
Power consumption
Performance Specifications for DSS Maximum fibre length50 km
Spatial Resolution0.5 m Location accuracyWithin 5 m or better
Strain Resolution2 Strain Accuracy 2 Signal Averaging1 to
16,000,000 Data collection time1 to 30 seconds, dependent on
distance, accuracy and interrogation method. Fault Detection /
ReportingProgrammable fault alarms and reports Sensor Life
Time>30 years Operating temperature range Control unit: +5 O C
to +60 O C Optical fibre cable: -30 O C to +70 O C Control unit
size4U 19 rack enclosure Operating Voltage 90 250 Vac 9-30 Vdc
Power consumption