一种面向结构沉降的改进型FBG传感器OA北大核心

In order to improve the sensitivity of fiber Bragg grating(FBG)type settlement sensors and reduce measurement devia-tions caused by tilt and temperature drift during the settlement process,an improved FBG sensor for structural settlement was de-signed.This sensor replaces the traditional cantilever structure with a straight pull structure to reduce measurement errors caused by settlement and tilt.By accurately calculating the ratio of wavelength offsets between two sets of FBGs,accurate measurement of settlement can be achieved.The test results show that the strain response of the sensor is 5.2 ×10-5 ε/N,and there is a linear re-lationship between wavelength shift and settlement within 0～50 mm.The average deviation is better than 0.69 mm,and the aver-age sensitivity is 107.45 pm/mm.The fluctuation of the test results is below 1.0％,which is significantly better than the traditional FBG sensor structure,verifying its better anti-interference ability.