高灵敏度空间倾斜测量光纤光栅传感器OA

To meet the technical requirements for multidirectional structural tilt measurement in practical engineering,a high-sensitivity circumferential fiber Bragg grating(FBG)tilt sensor was developed,ac-companied by systematic theoretical analysis and laboratory validation.A combined lug-boss and groove structural design was adopted to enhance the strain response of cantilevered equal-strength beams.Two or-thogonally arranged sensitized equal-strength beams enable synchronous sensing of two-dimensional spatial inclination.By applying differential signal processing to the central wavelength shifts of two FBGs mount-ed on opposite sides of the beam,temperature-induced effects are effectively eliminated while the measure-ment sensitivity is further improved.Experimental results indicate that the sensor exhibits sensitivities of 81.234 pm/(°)and 85.235 pm/(°)in the XOZ and YOZ planes,respectively,with linearity exceeding 0.999 79,a resolution better than 0.01°,measurement accuracies of 0.024 6%F.S.and 0.023 5%F.S.,and a measurement range of±30°.Spatial performance tests further demonstrate that stable and re-liable monitoring capability is maintained under two-dimensional tilt conditions.In addition,the sensor shows excellent repeatability(repeatability errors of 0.843% and 0.016%,respectively),low hysteresis(0.158% and 0.945%,respectively),and strong resistance to creep.These results indicate that the pro-posed sensor can provide high-precision and highly reliable tilt data for structural safety monitoring under complex working conditions,demonstrating significant potential for applications in engineering structural health diagnosis.