具有温度自补偿的保偏光纤布拉格光栅多参量传感器的设计与制备  

Temperature-independent multi-parameter sensor based on polarization maintaining fiber Bragg grating

作　　者：李建宇 董忠级 张吉宏 史雯慧 郑加金[1,3] 韦玮 Li Jian-Yu;Dong Zhong-Ji;Zhang Ji-Hong;Shi Wen-Hui;Zheng Jia-Jin;Wei Wei(College of Electronic and Optical Engineering&College of Flexible Electronics,Nanjing University of Posts and Telecommunications,Nanjing 210023,China;Xi’an Institute of Nonferrous Metal Survey and Design,China Nonferrous Metal Industry,Xi’an 710051,China;Jiangsu Special Optical Fiber Materials and Devices Preparation and Application Engineering Research Centre,Nanjing 210023,China)

机构地区：[1]南京邮电大学电子与光学工程学院、柔性电子(未来技术)学院,南京210023 [2]中国有色金属工业西安勘察设计研究院,西安710051 [3]江苏省特种光纤材料与器件制备及应用工程研究中心,南京210023

出　　处：《物理学报》2023年第14期123-130,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:62075100);江苏省研究生科研与实践创新计划(批准号:KYCX21_0704)资助的课题。

摘　　要：多参量的动态检测对于隧道、桥梁和管道等结构疲劳损伤的预测具有重要意义,开发一种高灵敏度、环境友好、低成本和易于操作的多参量动态检测技术一直是业界追求的目标.为了克服目前基于光纤布拉格光栅(fiber Bragg grating,FBG)的多参量传感器结构和原理复杂、制作成本高等问题,本文基于保偏光纤布拉格光栅(PM-FBG)设计并制作了一种结构简单且高灵敏度,单点可同时测量多个参量的新型传感器.该传感器通过传感臂可以同时测量某一点在两个垂直方向上的位移和扭转变化,并具有温度自补偿功能.实验结果表明:该传感器的快轴和慢轴对于温度的响应不同,其线性灵敏度分别为11.4 pm/℃和10.6 pm/℃,温度补偿系数为0.8 pm/℃,平均扭转灵敏度为0.20 dB/(°);该传感器的快轴和慢轴对位移/弯曲的响应相同,线性灵敏度为31.5 pm/mm.当改变传感器周围的温度场,其位移和扭转传感性能不受影响,可实现3个参量的同时测量.本文研制的PM-FBG新型多参量传感器可以保证高精度的温度、位移和扭转测量,同时具有较低的制作成本,有望为多参量动态检测提供一种新的手段.Dynamic multi-parameter detection is of great significance in predicting fatigue damage to structures such as tunnels,bridges,and pipelines.Developing a high-sensitivity,environmentally friendly,low-cost,and easy-tooperate multi-parameter dynamic detection technology has always been the goal of the industry.The polarization-maintaining fiber Bragg grating(PM-FBG)has a special grating structure composed of fiber Bragg grating(FBG)directly written into high birefringence and polarization-maintaining fiber,and it supports two distinct polarization eigenmodes with two effective refractive indices.The PM-FBG couples the light beams polarized along the two principal axes corresponding to slow axis and fast axis at two different Bragg wavelengths.The two peaks of PM-FBG have different responses to external changes,which may be used to solve the cross-sensitivity problem of FBG sensor and realize the simultaneous multi-parameter measurement of the temperature,longitudinal strain,transverse strain,or twist.In order to solve the problems of complex structure and principle and high production cost of FBG-based multi-parameter sensors,a novel multiparameter fiber-optic sensor with high sensitivity and temperature independence is designed based on PM-FBG in this work.The PM-FBG sensor proposed can simultaneously measure the changes of displacement and twist in two vertical directions at a certain point and has the function of temperature self-compensation.The external structure of the sensor is fabricated by using three-dimensional printing technology through the fused deposition method and the raw material for creating different components through using polylactic acid.Experimental results show that the fast axis and slow axis of the sensor have different temperature responses,with linear sensitivities of 11.4 pm/℃and 10.6 pm/℃,respectively,and the temperature compensation coefficient and average torsional sensitivity of the PM-FBG sensor are 0.8 pm/℃and 0.20 dB/(°),respectively.The fast axis and slow axis of the PM-F

关 键 词：光纤传感器 保偏光纤布拉格光栅 温度补偿 多参量传感 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]