基于时分复用的双通道锥形光纤磁场传感系统研究  

Research on dual-channel tapered optical fiber magnetic field sensing system based on time division multiplexing

作　　者：梁卓伟 张红娟[1] 高妍[1] 靳宝全 LIANG Zhuowei;ZHANG Hongjuan;GAO Yan;JIN Baoquan(College of Electrical and Power Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学电气与动力工程学院,太原030024 [2]太原理工大学新型传感器与智能控制教育部与山西省重点实验室,太原030024

出　　处：《光通信技术》2025年第1期83-87,共5页Optical Communication Technology

基　　金：中央引导地方科技发展资金项目(YDZJSX20231B004)资助;山西省科技创新人才团队专项(201805D131003)资助;山西省重点研发计划项目(202202130501004)资助。

摘　　要：为了解决磁流体光纤磁场传感器在复用能力上的限制,设计了一种基于时分复用(TDM)的双通道锥形光纤磁场传感系统。该系统通过将涂覆有磁流体的锥形光纤磁场传感单元连接至2个串联的光纤环,从而创建了2个独立的传感通道。这2个传感通道共享1套相干探测型相位敏感光时域反射计(φ-OTDR),它不仅用作脉冲光源,还承担信号检测和数字解调的功能。每个传感通道中均集成了一个磁场传感单元,利用TDM技术实现了多点磁场的同时测量。实验结果表明:2个传感通道能够独立工作,分别在3~14mT和2~7mT的磁场强度范围内具有-1.09dB/(km·mT)和-3.466dB/(km·mT)的高灵敏度,并且线性拟合度分别达到了99.4%和99.1%。To address the limitations of multiplexing capabilities in magnetic fluid optical fiber magnetic field sensors,a dual-channel tapered optical fiber magnetic field sensing system based on time division multiplexing(TDM)is designed.This system creates two independent sensing channels by connecting magnetic field sensing units coated with magnetic fluid to two cascaded optical fiber loops.These two sensing channels share a coherent detection phase-sensitive optical time-domain reflectometer(φ-OTDR),which not only serves as a pulse light source but also performs signal detection and digital demodulation functions.Each sensing channel integrates a magnetic field sensing unit,enabling simultaneous multi-point magnetic field measurements using TDM technology.The experimental results show that the two sensing channels can operate independently.They exhibit high sensitivity of-1.09 dB/(km·mT)and-3.466 dB/(km·mT)within the magnetic field strength ranges of 3 to 14 mT and 2 to 7 mT,respectively.The linear fitting accuracies reached 99.4%and 99.1%,respectively.

关 键 词：磁场测量 光纤传感 锥形光纤 磁流体 

分 类 号：TN91[电子电信—通信与信息系统]