多阶时域差分重构相关法拉曼分布式光纤传感  

Raman Distributed Optical Fiber Sensing Based on Multi-Order Time-Domain Differential Reconstruction Correlation

作　　者：李健[1,3] 范卜文 程姿嘉 薛晓辉 张明江 Li Jian;Fan Bowen;Cheng Zijia;Xue Xiaohui;Zhang Mingjiang(College of Electric Information and Optical Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China;College of Physics,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China;Key Laboratory of Advanced Transducers and Intelligent Control System,Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China)

机构地区：[1]太原理工大学电子信息与光学工程学院,山西太原030024 [2]太原理工大学物理学院,山西太原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,山西太原030024

出　　处：《光学学报》2024年第1期398-408,共11页Acta Optica Sinica

基　　金：国家自然科学基金(62205234,62075151,62205237);山西省青年科学基金(202103021223042);山西省科技成果转化引导专项(202204021301042);山西省专利转化专项计划(202302002)。

摘　　要：提出了一种基于多阶时域差分重构相关法的拉曼分布式光纤传感技术。该方案利用混沌信号、放大自发辐射(ASE)信号和噪声信号代替传统脉冲激光作为传感信号,基于多阶时域差分重构方法重构拉曼反斯托克斯散射信号,以此剥离出各个传感光纤位置点携带探测信号时序随机起伏特征的光强信息。最后基于相关压缩解调方法,揭示了拉曼散射温度调制光场空间位置与探测信号的相关特性。从理论上将时域差分重构方法推广至任意阶数,分析了差分阶数对传感系统信噪比的影响,并分析了面向混沌拉曼分布式光纤传感技术的最优差分阶数。研究了混沌信号、噪声信号、ASE信号这三种信号作为探测信号时拉曼传感系统的数值模拟情况,结果证明了拉曼光纤传感领域混沌信号在动态范围与信噪比方面具有显著优势,为长传感距离、高空间分辨率和高信噪比拉曼分布式光纤传感技术提供了新的研究思路。Objective Raman distributed optical fiber sensing technology has scientific significance across various fields due to its unique ability to perform distributed measurements of spatial ambient temperature fields.However,the spatial resolution of existing Raman distributed optical fiber sensing with a detection range extending to kilometers is constrained to the meter level due to the physical limitations of the optical time domain reflection positioning principle,which relies on the pulse time-of-flight method.Therefore,we introduce an innovative Raman distributed optical fiber sensing approach based on a multi-order time-domain differential reconstruction correlation method.In this novel method,we replace the conventional pulse laser with chaotic,amplified spontaneous emission(ASE),and noise signals as the sensing sources,and then employ a multi-order time-domain differential reconstruction technique to reconstruct the Raman anti-Stokes scattering signal.This reconstruction process enables us to extract intensity information from each sensing fiber position point and thus capture the random fluctuation characteristics of detection signal timings.To further optimize the proposed approach,we employ a correlation compression demodulation method to unveil the correlation between the spatial position of the Raman scattering temperature-modulated light and the detection signal.Notably,our scheme diverges from the traditional optical time-domain reflection positioning principle,opting instead for the correlation positioning principle.This shift allows us to overcome the physical constraints associated with the pulse width of conventional light sources,thereby elevating the spatial resolution of the sensing technology from the traditional meter-scale performance to the centimeter level.Methods The simulation model adopts intricate pulse signals as the detection signals,including chaotic pulse signals,noise pulse signals,and ASE pulse signals.This model bifurcates into two beams using a haloscope,with one beam serving as

关 键 词：光纤光学 分布式光纤传感 拉曼散射 空间分辨率 温度解调 

分 类 号：O436[机械工程—光学工程]