IDIL has developped 176 Fiber Bragg Gratings (FBGs) sensors photo-imprinted on 24 connectorized optical fibers.
Those optical fibers were designed to withstand alkaline metal while resins with a special reticulation process were used. Consequently, the manufactured cable is flexible enough to be packaged in strand and to follow the geometry of the structure that must be monitored.
This particulat shape enables to ensure a continuous and efficient fixation into concrete. Otherwise, this specific coating which consists of a semi-stiff cable allows a perfect information transfer from the concrete as far as the optical fiber without any change in the deformation field.
|Research Institute Collaboration||French Institute of Science and Technology for Transport, Development and|
|Objective||Demonstartors made out of smart composites with double-capacity of|
|structural health monitoring in-situ by both optical fiber sensors and ultrasonic|
|Footbridge dimensions||20 m long x 7 m large|
|Composition||Pultruded composites: glass fiber/vinylester and carbon/epoxy|
|IDIL Objectives||Integration of fiber optic sensors embedded in a beam of the footbridge by|
|Sensors types||Strain, temperature, vibration|
|Number of sensors||176 FBG sensors|
|Composition||Glass fiber, epoxy resin|
|Optical fiber||Single mode 1.5 µm SMF 28 (G 652 standard)|
|Number of fibers||6 fibers per beam (24 fibers in total)|
|Length||10 cm ≤ L ≤ 50 m|
|Outer diameter||80 µm fiber|
|Number of connectors||48 connectors|
|Metallic jacket diameter||4.6 mm. The length must be specified.|
|Number fo beams||4 beams|
|Thermal expansion coefficient||2.2 10-6 °C|
|Strength resistance||480 MPa|