Brillouin based fiber optic sensing turns to be a promising technology for Structural Health Monitoring (SHM).
However, the bare optical fiber is too fragile to act as a practical sensor, so high durability and large range (large strain)
Brillouin distributed sensors are in great needs in field applications. For this reason, high durable and large range optical
fiber Brillouin Optical Time Domain Analysis sensors packaged by Fiber Reinforcement Polymer (FRP), named
BOTDA(R)-FRP-OF, have been studied and developed. Besides, in order to study the large strain, crack and slip
between the rebar and concrete in reinforced concrete (RC) beams using BOTDR(A) technique, two RC Beams installed
with BOTDA(R)-FRP-OF sensors have been set up. And the damage characteristics of the RC beams were investigated
by comparing the strain measured by the BOTDA(R)-FRP-OF sensors and the strain from traditional electric strain
gauges. The test results show that the BOTDA(R)-FRP-OF sensor can effectively detect the damage (including crack and
slip) characteristic of RC beam, and it is suitable for the long-term structural health monitoring on concrete structures
such as bridge, big dam and so on.