高灵敏度游标增敏型光纤法布里-珀罗应变传感器  

High-Sensitivity Vernier Sensitized Fiber Optic Fabry-Perot Strain Sensor

作　　者：芮菲 葛益娴[1,2] 苏蕊 倪海彬 Rui Fei;Ge Yixian;Su Rui;Ni Haibin(School of Electronic and Information Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,Jiangsu,China;Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology,Nanjing University of Information Science and Technology,Nanjing 210044,Jiangsu,China)

机构地区：[1]南京信息工程大学电子与信息工程学院,江苏南京210044 [2]南京信息工程大学江苏省大气环境与装备技术协同创新中心,江苏南京210044

出　　处：《光学学报》2024年第16期59-67,共9页Acta Optica Sinica

基　　金：国家自然科学基金(61307061)。

摘　　要：提出并制备一种游标增敏型光纤法布里-珀罗(法珀)应变传感器,实现高灵敏度应变测量。该传感器由两个单模光纤-空芯光纤-单模光纤结构的法布里-珀罗干涉仪(FPI)并联组成,分别作为传感腔和参考腔。保持传感腔不变,选择不同的参考腔,利用游标效应解调,追踪并联后反射谱包络的漂移,可实现不同的放大倍数。实验结果表明:在0~900με的应变范围内,单个传感腔的应变灵敏度为1.31 pm/με,并联之后传感器的应变灵敏度分别达到-11.50 pm/με和-12.76 pm/με,放大了8.70倍和9.74倍,传感器的应变灵敏度显著提升,同时,传感器具备制作简单、高灵敏度、易操作和低成本等特点,具有广阔的应用前景。Objective Fiber optic strain sensors,with their immunity to electromagnetic interference,small size,light weight,and high stability in harsh environments,offer potential applications in numerous fields such as aerospace,biomedicine,and frozen soil monitoring.Recent research has demonstrated various fabrication techniques for these sensors,including fiber Bragg grating(FBG),long period fiber grating(LPFG),Fabry-Perot interferometer(FPI),tapered fiber,and diverse fiber optic interferometers.Some researchers have developed fiber optic sensors utilizing FP cavities and Mach-Zehnder interferometer(MZI)cascaded,achieving a strain sensitivity of 4.80 pm/μεover a 0 to 600μεrange,indicating low sensitivity.Others have introduced a novel parallel structure of fiber FPIs leveraging the cursor effect,comprising an open cavity FPI with a single-mode optical fiber(SMF)-SMF-SMF structure and a closed cavity FPI with an SMF-hollow core optical fiber(HCST)-SMF structure in parallel.This enhances the strain sensitivity of the sensor to−43.20 pm/με,which is 4.6 times higher than that of a single open chamber.However,despite its high strain sensitivity,this sensor is not widely adopted due to its large dislocation amplitude,manufacturing challenges,and low repeatability.In this study,we propose and prepare a vernier-sensitized fiber Fabry-Perot strain sensor to achieve high-sensitivity strain measurements.Methods In the high-sensitivity vernier sensitizer fiber Fabry-Perot strain sensor,both the sensor cavity and reference cavity employ an SMF-HCF-SMF structure for FPI.By adjusting the cavity lengths of both FPIs,two similar yet distinct free spectrum ranges(FSRs)are achieved,generating a vernier effect.As the external strain on the sensor cavity changes incrementally,the reflection spectrum of the sensor shifts,allowing for the measurement of the sensor’s strain sensitivity.Subsequently,the strain sensitivity of the single sensing cavity is compared with that of the two samples in parallel,resulting in a significant enhan

关 键 词：光纤光学 光纤传感 法布里-珀罗干涉仪 并联游标增敏 应变 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]