Design of strain measurement system with embedded fiber Bragg grating

The strain sensor with an embedded fiber Bragg grating has a great potential as an intelligent element for monitoring large construction work. The sensing mechanism of the strain sensor with an embedded fiber Bragg grating was discussed. A strain measurement system with embedded fiber Bragg grating was designed. The structure of the grating sensing probe and its fabrication were elaborated. The cross sensitivity between strain and temperature was overcome by using the tunable F-P filter to demodulate the grating signals. The strain measurement ranging from 0 to 1500με was realized. The feasibility of the system was verified by the theoretical analysis.