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UPC – BarcelonaTech experience on the use of
Rayleigh based distributed optical fiber sensors for
SHM of concrete structur...
UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structur...
Introduction – Fiber Optic Sensors
Cylindrical symmetric structure that is composed by a central
“core” with a diameter be...
Introduction – Fiber Optic Sensors
UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber s...
UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structur...
UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structur...
UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structur...
UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structur...
UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structur...
UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structur...
UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structur...
UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structur...
UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structur...
UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structur...
UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structur...
UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structur...
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UPC – BarcelonaTech experience on the use...
UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structur...
UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structur...
UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structur...
UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structur...
Questions?
António Barrias, Joan R. Casas, Sergi Villalba & Gerardo Rodriguez
ESREL 2017, 20th June 2017
This project has ...
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"UPC-BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structures" presented at ESREL2017 by Antonio Barrias

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Abstract: In the past decade, several works and studies have been performed with the goal of improving the knowledge and developing new techniques associated with the application of Distributed Optical Fiber Sensors (DOFS) in order to widen the range of applications of these sensors and also to obtain more correct and reliable data. In this document, after a very brief introduction to the fundamentals of this technology, the most representative work being developed at UPC—BarcelonaTech with the use of these sensors is going to be described. These applications range from laboratory experiments to real world structures monitoring scenarios where different challenges and particular issues had to be overthrown in each one of them. Furthermore, the most recent laboratory experiment performed by this group where DOFS were deployed is going to be described in greater detail.

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"UPC-BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structures" presented at ESREL2017 by Antonio Barrias

  1. 1. UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structures António Barrias, Joan R. Casas, Sergi Villalba & Gerardo Rodriguez ESREL 2017, 20th June 2017 This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No. 642453 TRUSS – Structural Safety 1
  2. 2. UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structures António Barrias / 20th June Portorož, Slovenia – ESREL 2017 Outline  Introduction  Distributed Optical Fiber Sensors (DOFS)  Laboratory Experiment with embedded DOFS  Conclusions
  3. 3. Introduction – Fiber Optic Sensors Cylindrical symmetric structure that is composed by a central “core” with a diameter between 4 and 600 µm and a uniform refractive index Advantages:  Immunity from electromagnetic interferences  Chemically inert – free from corrosion  Withstand high temperatures  Small and lightweight UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structures António Barrias / 20th June Portorož, Slovenia – ESREL 2017
  4. 4. Introduction – Fiber Optic Sensors UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structures António Barrias / 20th June Portorož, Slovenia – ESREL 2017 All possible crack openings are covered by the extension of the sensor
  5. 5. UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structures António Barrias / 20th June Portorož, Slovenia – ESREL 2017 Scattering in Optical Fibers Light Source DOFS Continuous sensing element Light backscatter provides three different components Light
  6. 6. UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structures António Barrias / 20th June Portorož, Slovenia – ESREL 2017 Optical Backscatter Reflectometer - OBR 1. OBR system measures the Rayleigh backscatter as a function of length in an optical fiber with high spatial resolution (1mm) 2. External stimulus 3. Temporal and spectral shifts in the local backscattered pattern 4. Shifts can be measured and scaled to give distributed strain or temperature measurements Swept wavelength interferometry (fiber is divided in small windows)  Short range (50-70 m)  High spatial resolution (1 mm)
  7. 7. UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structures António Barrias / 20th June Portorož, Slovenia – ESREL 2017 Laboratory test with embedded DOFS Main objectives:  Feasibility of installation of DOFS directly on rebar element of reinforced concrete beam  Comparison of strain measured at rebar and surface of the concrete  Detect and locate damage (cracks) induced by bending moment Two small reinforced concrete beams load test: 100x180x800 [mm]
  8. 8. UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structures António Barrias / 20th June Portorož, Slovenia – ESREL 2017 SG1 SG3 SG2DOFS DOFS attached to the rebar Rebar tensile test Laboratory test with embedded DOFS
  9. 9. UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structures António Barrias / 20th June Portorož, Slovenia – ESREL 2017 Laboratory test with embedded DOFS
  10. 10. UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structures António Barrias / 20th June Portorož, Slovenia – ESREL 2017 Laboratory test with embedded DOFS
  11. 11. UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structures António Barrias / 20th June Portorož, Slovenia – ESREL 2017 Beam 1 Beam 2 Laboratory test with embedded DOFS
  12. 12. UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structures António Barrias / 20th June Portorož, Slovenia – ESREL 2017 Beam 1 - Cyanoacrylate Beam 2 – Two-component epoxy Laboratory test with embedded DOFS
  13. 13. UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structures António Barrias / 20th June Portorož, Slovenia – ESREL 2017 BE-H2 BE-H1 FE-H3 FE-H2 FI FE-H1 FI – Front Interior FE-H(n) – Front Exterior Horizontal BE-H(n) – Bottom Exterior Horizontal Front - Interior View Front - Exterior View Bottom - Exterior View Adhered Fiber Non-Adhered Fiber Laboratory test with embedded DOFS
  14. 14. UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structures António Barrias / 20th June Portorož, Slovenia – ESREL 2017 -50 -40 -30 -20 -10 0 10 0 20 40 60 80 Load(kN) Time (min) Applied Load - Beam 1 -50 -40 -30 -20 -10 0 10 0 20 40 60 80 Load(kN) Time (min) Applied Load - Beam 2 Laboratory test with embedded DOFS
  15. 15. UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structures António Barrias / 20th June Portorož, Slovenia – ESREL 2017 BE-H2 BE-H1 FE-H3 FE-H2 FE-H1 FI Beam 1Laboratory test with embedded DOFS Cracking
  16. 16. UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structures António Barrias / 20th June Portorož, Slovenia – ESREL 2017 BE-H2 BE-H1 FE-H3 FE-H2 FE-H1 FI Beam 2Laboratory test with embedded DOFS Cracking
  17. 17. -50 -40 -30 -20 -10 0 10 0 20 40 60 80 Load(kN) Time (min) Applied Load - Beam 1 UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structures António Barrias / 20th June Portorož, Slovenia – ESREL 2017 Laboratory test with embedded DOFS Fiber stopped working F(crack) -50 -40 -30 -20 -10 0 10 0 20 40 60 80 Load(kN) Time (min) Applied Load - Beam 2 F(crack) Fiber stopped working
  18. 18. UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structures António Barrias / 20th June Portorož, Slovenia – ESREL 2017 Laboratory test with embedded DOFS BEAM 1 BEAM 2
  19. 19. UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structures António Barrias / 20th June Portorož, Slovenia – ESREL 2017 Laboratory test with embedded DOFS
  20. 20. UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structures António Barrias / 20th June Portorož, Slovenia – ESREL 2017 Laboratory test with embedded DOFS
  21. 21. UPC – BarcelonaTech experience on the use of Rayleigh based distributed optical fiber sensors for SHM of concrete structures António Barrias / 20th June Portorož, Slovenia – ESREL 2017 Conclusions  Proven feasibility of implementing an optical fiber with minimal coating directly to a embedded rebar element;  Proven feasibility on the detection and location of damage with this implementation technique;  Possibility of simultaneously measuring a large number of structural points with the use of a single sensor;  Fairly good agreement of the optical fiber data when compared with the strain gauges;  Poor performance of the optical fiber after the occurrence of damage in the location of the crack, specially in its embedded segment; Future work:  Analysis of different adhesives and bonding mechanisms between the fiber and the structure.  Study of the long-term reliability of this technology on concrete structures
  22. 22. Questions? António Barrias, Joan R. Casas, Sergi Villalba & Gerardo Rodriguez ESREL 2017, 20th June 2017 This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No. 642453 THANK YOU!

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