The advances in distributed fiber optic sensors in sensing cable design for distributed temperature and strain measurements and their significant field applications are discussed. The developed technologies of distributed fiber optic sensors are based on Raman and Brillouin scattering. The Brillouin frequency shift depends on local strain and temperature of the fiber such that the sensor set-up determines the actual response of the sensor. The temperature measurements is done by using a cable designed to shield the optical fibers from an elongation of the cable. The cross-sensitivity to temperature variations is resolved by installing a reference fiber along the strain sensor. The cables containing both free and coupled fibers allow a simultaneous reading of strain and temperature. Distributed sensing is used for temperature monitoring in a concrete dam and monitoring bitumen joints in a dam and gas pipelines.
|Original language||English (US)|
|Number of pages||5|
|State||Published - Sep 1 2007|
All Science Journal Classification (ASJC) codes
- Geotechnical Engineering and Engineering Geology