Fiber_Optic_Sensing_Applications-10_2016 (1).pptx

FBG applicability

1. Diagnostics of structures and geotechnical monitoring www.safibra.cz Using fiber optic technologies

2. Fiber optic sensing www.safibra.cz Opposite features to telecom optical fiber Needs for react to: Bending Elongation Strain Pressure Etc. Fiber Optic Sensing

3. Advantages of Fiber Optic Sensing www.safibra.cz Advantages • High sensitivity and accuracy (µm) • Monitor a multitude of sensors via a single fiber • No installation of an expensive and complex sensor infrastructure on-site necessary • Resistant to: corrosion, chemicals, water and lightning • Long-distance remote monitoring • Passive : no need for electrical power at the measuring point

4. Advantages of Fiber Optic Sensing www.safibra.cz Advantages • Small size, compact and lightweight • Durability and reliability in demanding environments • Multifunctionality : A large number of different parameters can be measured • 100% passive : no need for electrical power at the measurement point • Additional use of the already existing fiber-optic network

5. Sensor types www.safibra.cz Sensor types

6. Fiber Bragg Grating – FBG www.safibra.cz FBG Technology A Fiber Bragg Grating (FBG) is a type of distributed Bragg reflector constructed in a short segment of optical fiber that reflects particular wavelengths of light and transmits all others .

7. Advantages of FBGs www.safibra.cz FBG Advantages • Immune to EMI/RFI • Non-conductive and hence no special precautions needed for outdoor use or usage under water • Spark-free and hence safe in potentially explosive environments • Long measurement distances • Possible to multiplex, i.e. multiple sensors can be allocated within the same optical fiber • Excellent fatigue resistance : negligible effects for at least 2 million cycles for ± 0.24% straining

8. Different FBG sensors www.safibra.cz FBG Sensors • Many different types of FBG sensors : Temperature, strain, elongation, vibration , pressure, etc. • Many different types of: mechanics, installation, cable protection, etc. • Proprietary development of new and custom-built applications (asphalt sensor , tunnel lining, etc.) • A lot of R&D activities

9. Various applications www.safibra.cz FBG Applications • Geo-technical monitoring • Fundament stability monitoring • Borehole deformation • Mines • Dams • Buildings • Telecom cabinets • Manholes monitoring • High temperature monitoring • Power plants • Tunnels • Bridges • Oil & Gas structures • Wind & tidal energy structures • Transportation • Marine

10. www.safibra.cz Safibra ’s products Monitoring systems SHM interrogation unit Perimeter security system Free space object monitoring

11. www.safibra.cz Monitoring system

12. SHM –Bridges monitoring www.safibra.cz FBG Applications Crack in the bridge fundament Real time response Long-term observation Data for maintenance management

13. SHM –Bridges monitoring www.safibra.cz FBG Applications

14. SHM – embankment monitoring www.safibra.cz FBG Applications Landslide caused by groundwater Colored scale shows the degree of deformation

15. Weight in motion system www.safibra.cz FBG Applications Parts: • Fiber Optic FBG sensors in underlayer • Detection Rings in underlayer • Temperature sensors in underlayer • System enclosure Detection ring and FO sensor distances All equipment in the bottom -layer of asphalt and not extremely maintenance sensitive as conventional

16. Weight in motion system www.safibra.cz FBG Applications Data Output • Date/time • Speed • Length • Distance between vehicles • Axle-weight • Axle-group weight • Total vehicle weight • Axle distances • Number of axles • Category • Bending front • Weight per Wheel • Width per Wheel • Length per Wheel • Wheel position • Single or double Wheel • Temperature under asphalt top layer

17. Railways monitoring www.safibra.cz FBG Applications

18. Cabinet / manholes monitoring www.safibra.cz FBG Applications

19. Power pole /pylon www.safibra.cz FBG Applications

20. Periguard www.safibra.cz Security system Perimeter Monitoring and Protection • Principle : Monitoring light changes in sensing fiber - specles • Applications : Fence Perimeter – chain link, ornamental, anti-climb Underground perimeter – buried in gravel, sand, sod and other materials

21. Object sense www.safibra.cz Objects monitor Exact measurement of vertical change in position • Principle : Change in intensity of reflected light is measured • Applications : – Displacement detection in geotechnical structures: rails, walls, embankments, slopes , levees, roads, landfills – Deformation of objects – Monitoring of objects and buildings

22. www.safibra.cz Safibra, s.r.o. Černokostelecká 1621 251 01 Říčany Czech Republic Ing. Martin Dušek Sales and project engineer Fiber Optics & Photonics Tel: [phone] Fax: [phone] Cell: [phone] E-mail : [email protected] www: http:// www.safibra.cz Thank you