基于拉锥细芯光纤的大量程双参量传感器  

A large range double parameter sensor based on tapered thin core fiber

作　　者：鲁志琪 李驰 周文标 任杰 彭敏 刘昌宁 LU Zhiqi;LI Chi;ZHOU Wenbiao;REN Jie;PENG Min;LIU Changning(College of Physics and Electronic Science,Hubei Normal University,Huangshi,Hubei 435000,China)

机构地区：[1]湖北师范大学物理与电子科学学院,湖北黄石435000

出　　处：《光电子．激光》2024年第10期1018-1023,共6页Journal of Optoelectronics·Laser

基　　金：湖北师范大学研究生教育教学改革研究重点项目(2023JY02);教学改革与研究一般项目(2023071);湖北师范大学省级重点实验室开放基金(PMD202413);国家级大学生创新创业训练计划项目(202310513001,202310513025)资助项目。

摘　　要：折射率与轴向应变的监测是工程应用的重要组成部分。为了实现大量程的折射率、应变双参量测量传感器,提出了一种基于锥形细芯光纤(thin-core fiber,TCF)传感器。首先在两段标准单模光纤(single-mode fiber,SMF)之间熔接一段长度为2 cm的TCF,然后在TCF中心放电并拉锥,制作得到一个全光纤马赫-曾德尔干涉仪(Mach-Zehnder interferometer,MZI)。在实验中,利用丙三醇溶液替代氯化钠(NaCl)溶液可扩大折射率的测量范围。实验结果表明,在1.3511—1.3803范围内,折射率的最高灵敏度为-20.95 nm/RIU;在1.3843—1.4466范围内,折射率的最高灵敏度可达-294.32 nm/RIU。在0—2727με的应力范围内,表现出-0.6 pm/με的应变灵敏度,说明该结构在折射率量程大且灵敏度高的前提下,也维持着较强的鲁棒性。该器件制备简单、结构紧凑,在折射率和应力测量等领域具有一定的应用价值。Monitoring refractive index and axial strain is crucial in engineering applications.To achieve a large range sensor for the measurement of dual parameters of refractive index and strain,we propose a fiber sensor based on a tapered thin-core fiber(TCF).A compact all-fiber Mach-Zehnder interferometer(MZI)is fabricated by fusing a 2 cm length of TCF between two standard single-mode fibers(SMFs),charging and tapering it in the center.In our experiment,we extend the measurement range of the refractive index by using propylene glycol solution instead of sodium chloride solution.The results show that the highest sensitivity of the refractive index is-20.95 nm/RIU in the range of 1.3511—1.3803 and can reach-294.32 nm/RIU in the range of 1.3843—1.4466.In the strain range of 0—2727με,it exhibits a sensitivity of-0.6 pm/με,indicating that the structure maintains strong robustness even with a large refractive index range and high sensitivity.The device is simple to manufacture,compact,and has application value in refractive index and strain measurement.

关 键 词：折射率 应力 细芯光纤(TCF) 拉锥 传感器 

分 类 号：TN253[电子电信—物理电子学]