基于G-S混合编码的分布式单模光纤测温方法研究  

Research on distributed single-mode fiber temperature measurement method based on G-S hybrid coding

作　　者：李昭旭 王宇 郭欣明 刘昕[2,3] 白清 靳宝全 Li Zhaoxu;Wang Yu;Guo Xinming;Liu Xin;Bai Qing;Jin Baoquan(School of Physics and Optoeletronic Engineering,Taiyuan University of Technology,Taiyuan 030024,China;School of Electronic Information Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Key Laboratory of Advanced Transducers and Intelligent Control System of Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学物理与光电工程学院,太原030024 [2]太原理工大学电子信息工程学院,太原030024 [3]太原理工大学新型传感器与智能控制教育部重点实验室,太原030024

出　　处：《电子测量与仪器学报》2025年第1期244-252,共9页Journal of Electronic Measurement and Instrumentation

基　　金：山西省水利科学技术研究与推广项目(2024GM18);山西省重点研发计划项目(202102130501021);中央引导地方科技发展资金项目(YDZJSX20231B004)资助。

摘　　要：为了减少分布式单模光纤温度传感系统的测温误差,文中提出了一种基于Golay-Simplex混合编码的单模光纤温度测量方法。首先将4路G码进行S码变换实现了12路G-S混合编码调制,再依次对12路编码输出信号进行S码解码处理与G码解码处理,并采用累加平均与小波变换进行了测温曲线降噪,验证了G-S混合编码的编码增益为G码与S码的编码增益乘积。对比实验结果表明,在30 km单模光纤长度、50 ns脉宽与64 bit编码长度的条件下,G-S混合编码测温系统的反斯托克斯信号幅值曲线波动范围较小,且在整个光纤长度内信噪比较大,信噪比高于Golay码编码测温系统和单脉冲测温系统。G-S混合编码的稳态测温误差可从单脉冲系统的±7.3℃优化至±2.5℃,优于Golay编码分布式拉曼光纤测温系统的测温误差±3.9℃。而空间分辨率可保持为5 m,证明了G-S混合编码在长距离单模光纤测温方面的有效性,有望为水利大坝渗漏温变等基础设施状态的融合感知提供有效的技术解决方案。To reduce the temperature measurement error of distributed single-mode fiber temperature sensing systems,the paper proposes a temperature measurement method based on Golay-Simplex hybrid coding.First,four G codes are transformed into S codes to achieve 12-channel G-S hybrid coding modulation.Then,the output signals of the 12 channels are processed through S code decoding and G code decoding sequentially,employing cumulative averaging and wavelet transformation for temperature curve denoising.This verifies that the coding gain of the G-S hybrid coding is the product of the coding gains of the G and S codes.Comparative experimental results show that under conditions of 30 km fiber length,50 ns pulse width,and 64 bit coding length,the amplitude fluctuation range of the anti-Stokes signal curve in the G-S hybrid coding temperature measurement system is smaller and has a higher signal-to-noise ratio across the fiber length compared to the Golay code-based temperature measurement system and the single-pulse temperature measurement system.The steady-state temperature measurement error of the G-S hybrid coding can be optimized from±7.3℃in the single-pulse system to±2.5℃,outperforming the measurement error of±3.9℃in the distributed Raman fiber temperature measurement system based on Golay codes.Additionally,the spatial resolution can be maintained at 5 m,demonstrating the effectiveness of G-S hybrid coding for long-distance single-mode fiber temperature measurement,potentially providing effective technical solutions for the integrated perception of infrastructure conditions such as temperature changes due to leakage in hydraulic dams.

关 键 词：光纤温度传感 拉曼光时域反射 脉冲编码 G-S混合编码 测温误差 

分 类 号：TN247[电子电信—物理电子学]