萨格纳克干涉仪级联的高灵敏度温度传感器  

High sensitivity temperature sensors based on Sagnac interferometers cascading

作　　者：申万梅 江超 郭小珊 黄会玲 李宏 SHEN Wan-mei;JIANG Chao;GUO Xiao-shan;HUANG Hui-ling;LI Hong(College of Physics and Electronic Science,Hubei Normal University,Huangshi 435002,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435002

出　　处：《激光与红外》2022年第5期740-744,共5页Laser & Infrared

基　　金：湖北师范大学中青年科技创新团队项目(No.T2015002);湖北省高等学校优秀中青年科技创新团队计划项目(No.T2020014)资助。

摘　　要：设计了一种由两个萨格纳克干涉仪(SI)级联组成的光纤温度传感器,并用实验证明了传感器在游标效应下的温度灵敏度放大特性。该传感器由两段不同长度的熊猫保偏光纤构成两个SI,然后两个SI旋转一个角度级联在一起组成一个温度传感装置,其中SI_(1)用着温度传感,SI_(2)用着参考。由于两个SI具有相近的自由光谱范围,级联时它们干涉谱叠加形成一个自由光谱范围很大的低频包络线。利用包络线漂移来考察温度变化,能够获得放大的灵敏度。实验结果显示级联后传感器的温度灵敏度为11.03 nm/℃,而单个SI_(1)单独测量温度的灵敏度为-1.01 nm/℃。因此利用游标效应后,灵敏度增加了10.9倍,而且实验测量结果与理论计算结果基本吻合。An optical fiber temperature sensor comprising two Sagnac interferometers(SI)cascading is designed and experimentally demonstrated the temperature sensitivity amplification properties of the sensor under the vernier effect.The sensor consists of two SI with different length panda fibers,and then two SI rotates one angle to cascade together forming a temperature sensing device,where SI1 used as temperature sensing and SI2 as reference filter.Since the two SI have a similar free spectrum range,when they are cascaded,their output spectrum forming a low-frequency envelope with the large free spectrum ranges.The sensitivity of amplification can realize when using the envelope drift to investigate the temperature changes.The experimental results show that the temperature sensitivity of the sensor is 11.03 nm/°C,while the temperature sensitivity of the single SI1 is-1.01 nm/°C.Therefore,after using the Vernier effect,the sensitivity increases by 10.9 times,and the experimental measurement results are in good agreement with the theoretical calculations.

关 键 词：光纤传感器 萨格纳克干涉仪(SI) 保偏光纤(PMF) 熊猫光纤(PF) 温度 

分 类 号：TN253[电子电信—物理电子学]