Distributed fibre-optic sensors (DFOS) are advanced measurement systems that use the optical fibre as a continuous sensor for measuring physical quantities along its entire length. These technologies are extremely valuable in non-destructive testing and structural health monitoring.
Distributed fibre-optic sensors (DFOS) are advanced measurement systems that use the optical fibre as a continuous sensor for measuring physical quantities along its entire length. These technologies are extremely valuable in non-destructive testing and structural health monitoring because they provide continuous measurements over long distances with high spatial resolution and are immune to electromagnetic interference.
1. Strain and stress monitoring
DFOS sensors can measure strain along the entire length of the optical fibre, allowing the stress and shape changes of structural elements — such as bridges, concrete beams or composite materials — to be tracked. Changes in the strain profile often signal the appearance and development of cracks before they become visually apparent.
Key benefits:
- Continuous strain measurement instead of point-wise readings
- Early detection of local anomalies
- Damage evolution from micro to macro level
2. Structural health monitoring (SHM)
DFOS technology is widely used in civil engineering for long-term monitoring of infrastructure — bridges, dams, tunnels and pipeline systems. Sensors provide continuous data on strain and temperature, helping to evaluate integrity and material degradation under operational loading.
Examples of monitored elements:
- Bridge girders and decks
- Concrete support columns
- Construction dams
- Tunnels and underground structures
3. Temperature measurement and compensation
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