Fiber-optic Fabry-Perot Interferometric(FFPI) sensor was embedded in the scaled down reinforced concrete structure and its characteristics were investigated. The intrinsic FFPI consists of two internal mirrors 11 mm apart in the optical fiber and TiO_...
Fiber-optic Fabry-Perot Interferometric(FFPI) sensor was embedded in the scaled down reinforced concrete structure and its characteristics were investigated. The intrinsic FFPI consists of two internal mirrors 11 mm apart in the optical fiber and TiO_(2) thin film was sputtered for the mirrors. The sensor showed excellent optical interference characteristics and the phase shift of the sensor output signal was proportional to the external loads applied to the structure. Three sensors at different points were multiplexed by the TDM method, so the deformation to the external loads at each point in the structure could be simultaneously monitored.