fibrisTerre

Temperature and strain measurement using optical fiber – the system is based on Brillouin scattering.

Industrial-grade data accuracy: <2µε for strain and <0.1°C for temperature
Spatial resolution down to 20 cm
Fiber distance range up to 50 km
Higher attenuation budget
Full loop measurement, no need for additional optical fibers

Reliable and continuous structural monitoring
Continuous monitoring is essential for managing the risk and maintenance of large structures. Where kilometers of concrete, steel or soil must be monitored for early failure detection, distributed optical fiber sensors are an efficient tool for this purpose.
Thanks to its industry-leading accuracy, fibrisTerre’s unique BOFDA technology meets the reliability requirements of long-term monitoring of pipelines, power cables routed along roads and geotechnical infrastructure.
The fTB 2505 system uses standard optical fibers (the same as in everyday telecommunications) as continuous, long-distance temperature and pressure sensors. The use of additional coatings allows for reliable and versatile implementation in soil and rigid structures.

Brillouin scattering detection
Two waves introduced into the two ends of the optical fiber meet, causing vibrations and creating an acoustic wave inside the fiber. Under the influence of this acoustic wave, the light arriving at the instrument carries information about the speed of sound propagation in the fiber, which in turn provides information about its strain and temperature.

Typical applications:

Monitoring of oil and gas pipelines and boreholes
Early detection of damage in geotechnical structures
Fatigue monitoring of materials used in bridges, tunnels and dams
Strain and temperature monitoring in mining
Monitoring of riverbank displacement

Comprehensive monitoring solution
fibrisTerre provides

Quality of installation and management through a strong partner and integrator network
Tailored packages for new construction
Specific solutions for retrofitting existing structures
Long-term partnership for reliability in maintenance and system upgrades

Key features:
The patented fibrisTerre optical frequency-domain analyzer offers:

Industrial-grade data accuracy: <2µε for strain and <0.1°C for temperature
Spatial resolution down to 20 cm
Fiber distance range up to 50 km
Higher attenuation budget
Full loop measurement, no need for additional optical fibers
High precision of fiber length measurements
Access to raw data
Environmentally friendly due to low weight and low power consumption

User interface
The fTB2505 readout unit is controlled by a remote or local computer via Ethernet.
fibrisTerre’s fTView is powerful monitoring software that enables the user to configure, perform, display and manage measurements.

Simple measurement setup
Automatic, long-term monitoring at user-defined intervals
Unique, powerful signal-processing engine
Multiple options for data export, management and visualization

Performance, features and technical data:

Fiber type:		Standard: single-mode
Optical connectors		E-2000/APC
Sensor configuration		loop
Distance range (fiber loop)		50 km 1)
Spatial resolution	up to 2 km fiber up to 25 km fiber up to 50 km fiber	0.2m 1) 0.5m 1m
Spatial accuracy		0.05m
Optical budget		>20dB
Measurable parameters		Brillouin frequency shift, temperature, strain
Accuracy and range	strain temperature Brillouin frequency shift	<2µε -3% to +3% 4) <0.1°C -273 to +1000°C 4) <100kHz 10-13GHz 4)
Typical acquisition time 5)	0.2 km fiber 2km fiber 10km fiber 25km fiber	20 seconds 1 minute 8 minutes 25 minutes
Communication interface		Ethernet
Data export format		Binary, ASCII
Measurement modes		Single measurement on demand; continuous monitoring Automatic detection of fiber length and attenuation
Remote operation		Remote measurements, system diagnostics
Operating temperature		5-40°C
Dimensions	L x W x H	495 x 482 x 145mm
Weight		13kg
Power consumption		60W
Laser class		1M

¹⁾The standard distance is 25 km. Distance range extension on request.
²⁾Software resolution extension selectable in the user interface.
³⁾High optical losses along the sensing fiber may affect strain/temperature accuracy.
⁴⁾Limited by the fiber.
⁵⁾Estimated for typical measurements. Measurement time may vary depending on the strain/temperature precision resolution.

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