B7.4 - Health monitoring of geotechnical structures by distributed fiber optic sensors
- AMA Conferences 2017
2017-05-30 - 2017-06-01
- Proceedings Sensor 2017
- B7 - Distributes and Fiber Bragg Grating Sensing II
- A. Wosniok, S. Liehr - BAM Bundesanstalt für Materialforschung und -prüfung, Berlin (Germany)
- 280 - 285
Health monitoring of ground movement via highly sensitive fiber optic sensors allows operators to detect early potential or ongoing failures in critical geotechnical structures. Particularly, the fiber optic sensors can be embedded in geosynthetics which are nowadays widely used in many geotechnical applications including earth dikes, railway embankments, landfill liners, quarries and mines. Thereby, such smart geosynthetics can be used for reinforcement, layer separation, filtration or drainage while the embedded fiber optic sensors provide information about the condition of the geotechnical structures in real time. The paper highlights the results achieved in this innovative field in the framework of several German and European projects. The presented measurement methods for longterm monitoring are based on Brillouin scattering in silica glass optical fibers (GOFs) and optical time domain reflectometry (OTDR) in polymer optical fibers (POFs).