基于保偏光纤与少模光纤的激光温度传感器  

Laser temperature sensor based on polarization maintaining fiber and few mode fiber

作　　者：陈志萌 黄昌清 Chen Zhimeng;Huang Changqing(College of Optical and Electronic Technology,China Jiliang University,Hangzhou,Zhejiang 310018,China)

机构地区：[1]中国计量大学光学与电子科技学院,浙江杭州310018

出　　处：《光电工程》2024年第11期17-25,共9页Opto-Electronic Engineering

基　　金：浙江省基础公益研究计划(LGG19A040001)。

摘　　要：本文提出了一种基于保偏光纤与少模光纤的激光温度传感器,并对其进行了实验研究。将20 cm的保偏光纤与10 cm的少模光纤熔接在一起,之后与3 dB耦合器组成Sagnac环,作为传感探头。光经过少模光纤激发出高阶模,由于少模光纤与保偏光纤直径不匹配,高阶模与纤芯模耦合到保偏光纤的应力区,激发出包层模,从而提高温度灵敏度。实验结果表明,加入少模光纤后,传感器的温度灵敏度从−0.51 nm/℃提高到−0.91 nm/℃。该传感器具有精度高、制造方便、本质安全等优点,在工程结构安全监测中具有广阔的应用前景。This paper proposes a laser temperature sensor based on polarization maintaining fiber(PMF)and fewmode fiber(FMF),and conducted their experimental studies.A 20 cm polarization maintaining fiber was spliced with a 10 cm few-mode fiber and then combined with a 3 dB coupler to form a Sagnac loop,which served as the sensing probe.Light passing through the FMF excites higher-order modes.Due to the diameter mismatch between the FMF and PMF,the higher-order modes are coupled into the stress region of the PMF,exciting the cladding modes and thus improving temperature sensitivity.Experimental results show that after adding the FMF,the temperature sensitivity of the sensor increased from−0.51 nm/℃to−0.91 nm/℃.This sensor has the advantages of high precision,easy fabrication,and intrinsic safety,making it highly promising for engineering structure safety monitoring applications.

关 键 词：少模光纤 保偏光纤 光纤萨格纳克干涉仪 光纤温度传感器 光纤激光传感器 

分 类 号：TN253[电子电信—物理电子学]