DFOS - What can we measure

Sense different physical quantities

DFOS technology is not limited to a single type of measurement.

Typically, Nerve-Sensors are manufactured with at least 2 sensing fibres for redundancy and increased accuracy. This also makes it possible to create an optical loop at the end of the sensor, or to connect fibres to various interrogators in order to read different physical quantities simultaneously.

The system can be designed in terms of Nerve-Sensor type, interrogator, installation method and data processing to measure the following physical quantities:

DSS
Strain and crack

DAS
Acoustic
(strain rate)

DTS
Temperature

DDS
Displacement

DSS ➝ Distributed strain sensing

Strain (µε) measurements in longitudinal direction of the sensor allow to analyse local elongation and shortening, and corresponding stresses and cracks. What is important, based on the strain profiles, detailed analysis of cracks can be made (identification, localisation, width estimation).

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DTS ➝ Distributed temperature sensing

Temperature or temperature change (°C) is usually measured with Raman scattering. Knowledge of thermal changes is used for detecting leaks or fires, and also necessary to compensate measurements using distributed strain sensing.

Choose EpsilonSensor, EpsilonGraph or EpsilonRebar from Nerve-Sensors

DDS ➝ Distributed displacement sensing

Displacement (mm) or shape change can be measured using our patented 3DSensor, unique in the word. Thanks to the appropriate design of the cross-section and the use of multiple strain-sensing fibres, it allows for detection of local curvatures (both in the horizontal and in the vertical direction). Including boundary conditions, the final output is displacements (movements, deflections) perpendicular to the sensor axis, expressed directly in millimetres.

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DAS ➝ Distributed acoustic sensing

This sub-technique allows to analyse the speed of strain change, called strain rate (nε/s). Extremely high sensitivity and frequency (kHz range) with maximum distance of more than 100 km (per channel), makes it a perfect tool for detection and analysis of different vibration sources (cars, trucks, trains, construction works, leakages, intrusion and more).

Choose EpsilonSensor, EpsilonRebar or 3DSensor from Nerve-Sensors