摘要
针对力热耦合环境中对结构件应变测试的准确获取问题,提出一种基于夹持粘贴式与温度补偿解耦的裸光纤光栅传感器应变测试方法。首先,通过有限元分析对比夹持粘贴式、表面粘贴式两种与基材集成方式的应变传递率,两者应变传递率分别为99.47%与95.8%;然后,以光纤胶粘应变传递理论及有限元仿真分析不同标距比对夹持粘贴式光纤光栅传感器应变传递率的影响,发现随着标距比增加,应变传递率逐渐衰减。基于粘贴形式与标距比分析结果,选取标距比为1的夹持式裸光纤光栅与基材粘贴集成为试验件,同时集联一条裸光纤光栅温度传感器,在完成对光纤光栅温度/应变标定测试后,进行100~250℃、3 000με范围内的试验件梯度高温拉伸测试。实验结果表明,利用温度补偿法解耦出光纤光栅传感器测量的应变结果与标准高温应变片结果的平均相对误差最大值为2.26%。该研究结果对高温下光纤光栅传感器应变测量与集成的工程应用具有一定参考意义。
To solve the problems of inaccurate results in the theoretical calculation of Fiber Bragg Grating(FBG)sensors for strain testing at high temperatures,and the complexity of the preparation process of special fiber gratings,moreover,to enhance the operability of strain testing in practical engineering by using FBG,this paper proposes a bare FBG sensors testing method based on the clamp-adhesive type,and combines the temperature compensation method,to achieve the accurate measurement of 3000με within 250℃.Firstly,for the problem of temperature-strain cross-sensitivity,the temperature compensation method is proposed to remove the effect of temperature,and the formula is derived.Based on this formula,the temperature compensation based FBG sensor temperature decoupling method is by using another FBG sensor that only responds to temperature.Then,after the two FBG sensors are integrated with the substrate,a suitable paste method can be selected so that one sensor can only sense temperature,and another sensor can sense temperature and strain,and the real strain value can be obtained after the temperature value brought into the formula.Secondly,the strain transfer rates of two FBG integration methods(clamp-adhesive and surfaceadhesive)are compared by finite element analysis,and the simulation results indicate that the strain curve of the clamp-adhesive method fits the substrate strain curve better,and the strain transfer rate is 99.47%.In contrast,the gap between the strain of the surface pasted method and the substrate strain is larger,and the strain transfer efficiency is 95.8%.Therefore,the strain transfer efficiency of the clamp-adhesive sensor is higher than that of the surface-adhesive FBG sensor.In addition,the surface-adhesive type needs to cover the grating of the Bragg grating sensor with glue,and the change of the material properties of the adhesive layer in the high temperature environment has a large impact on the reflection of the grating,so the penetration of the glue into the fiber grating area will mak
作者
李鑫
黄薏静
于纪成
徐赵洁
马冠军
LI Xin;HUANG Yijing;YU Jicheng;XU Zhaojie;MA Guanjun(School of Mechanical and Materials Engineering,North China University of Technology,Beijing 100144,China)
出处
《光子学报》
EI
CAS
CSCD
北大核心
2024年第3期27-37,共11页
Acta Photonica Sinica
基金
国家自然科学基金(No.52205001)。
关键词
光纤光栅传感器
应变传递
夹持粘贴式
有限元分析
高温应变测试
温度补偿解耦
Fiber grating sensor
Strain transfer
Clamp-adhesive type
Finite element analysis
Strain testing under high temperature
Temperature compensation decoupling
