A review of various fiber optic sensor technologies and their practical implication in the form of packaged sensors and readout instruments for geotechnical instrumentation and monitoring is discussed. Fabry-Pérot Interferometric sensors have a single measurement point at the end of the optical connection cable of a dam and when light is coupled into one of the fibers, a back-reflected interference signal is obtained. Fiber Bragg grating sensors allow measurements at multiple points along a single fiber line and can be replaced for conventional strain gages and installed by gluing them on metal and other smooth surfaces. SOFC interferometric sensors are long-base sensors integrating the measurement over a long measurement base that can reach 10m or more and is used to monitor 300 kinds of structures. Distributed Brillouin Scattering and distributed Raman scattering sensors use an intrinsic property of standard telecommunication fibers for scattering light.
|Original language||English (US)|
|Number of pages||5|
|State||Published - Sep 1 2007|
All Science Journal Classification (ASJC) codes
- Geotechnical Engineering and Engineering Geology