准分布式FBG对应变和温度双参数分离测量的实现

The Implementation of Two-Parameter Measurement of Strain and Temperature Using Quasi-Distributed FBG

为解决光纤Bragg光栅(FBG)的应变与温度交叉敏感问题,提出了一种将两个参数相同的FBG分别放置于承重梁上下两端面同时感知应变与温度的方法,通过理论分析计算,实现了应变、温度双参数传感的目的.该方法既克服了传统双参数分离方法的各种限制,又简化了分离算法.标定与测量实验结果表明:在温度0-100℃、应变0-40MPa范围内,FBG的应变与温度响应曲线呈现良好的对应关系,最大相对误差分别为3.7%和4.2%.应变与温度分离测量方案简单易行,将其应用于准分布式应变定位领域,可以实现应变位置的识别与预警,具有较高的实际应用价值.

In order to solve the cross sensitivity problem of strain and temperature measurement existing in Fiber Bragg Grating,a scheme that implement two-parameter measurement of strain and temperature by placing two FBG at upper and lower end face of a bearing beam is presented.This scheme can both overcome the restriction of traditional two-parameter measurement method and simplify the separation algorithm.Calibration and measurement experiments results indicated that the response curves of strain and temperature demonstrate good corresponding relationship in the range of 0 - 100℃ and 0 -40 MPa,and the maximum error is 3.7% and 4.2% respectively.This scheme is feasible to locate the position of strain point in quasi-distributed FBG,and has high application value.