A research of stress survey system based on fiber Bragg grating

A double fiber grating strain sensor based on the temperature compensation is proposed in this paper. FBG is stuck on a specialist ructured cantilever. The sensor is constructed by the connecting optical fiber, sensing grating, cantilever beam, mass and support. The sensor is fixed on an object to be measured. The cantilever beam structure is used in this paper to ensure the good linearity in measuring range of sensor grating wavelength drift. The experiment result indicate that the distance of center wavelengths of two reflecting peaks is relative not to temperature change but load variety as linearity. Carries on the data fitting to the experimental findings, and the linearity is up to 0.96.