提高分布式温度传感器测温准确度的降噪方法  

Noise Reduction Method to Improve Temperature Measurement Accuracy of Distributed Temperature Sensor

作　　者：孙苗 汤玉泉 杨爽 赵晓虎 张志荣[2] 庄飞宇 Sun Miao;Tang Yuquan;Yang Shuang;Zhao Xiaohu;Zhang Zhirong;Zhuang Feiyu(College of Physics and Materials Engineering,Hefei Normal University,Hefei 230601,Anhui,China;Anhui Provincial Key Laboratory of Photonic Devices and Material,Anhui Institute of Optics and Fine Mechanics,Hefei Institute of Physical Sciences,Chinese Academy of Sciences,Hefei 230031,Anhui,China;Anhui Province Key Laboratory of Simulation and Design for Electronic Information System,Hefei Normal University,Hefei 230601,Anhui,China)

机构地区：[1]合肥师范学院物理与材料工程学院,安徽合肥230601 [2]中国科学院合肥物质科学研究院安徽光学精密机械研究所光子器件与材料安徽省重点实验室,安徽合肥230031 [3]合肥师范学院电子信息系统仿真设计安徽省重点实验室,安徽合肥230601

出　　处：《激光与光电子学进展》2022年第19期145-151,共7页Laser & Optoelectronics Progress

基　　金：安徽省高校自然科学研究重点项目(KJ2019A0722,KJ2021A0909);电子信息系统仿真设计安徽省重点实验室重点项目(2020ZDSYSZD03);安徽省大学生创新创业训练项目(14098086);中国科学院合肥物质科学研究院院长基金青年“火花”项目(YZJJ2020QN3)。

摘　　要：为了减小拉曼散射光波长相关损耗、光电探测器附加噪声及散射光中的瑞利噪声对分布式光纤温度传感器测温误差的影响,通过分析分布式光纤温度传感系统的解调原理提出了一种反斯托克斯光降噪方法。将光纤按照环形结构铺设,以每次测量的反斯托克斯光信号中菲涅耳反射峰后的基底噪声平均值作为动态本底噪声,利用两段处于不同温度的光纤消除动态本底噪声后的瑞利噪声。反斯托克斯光降噪解调法从原理上避免了参考斯托克斯光引入的测温误差,消除了本底噪声和瑞利噪声导致的测温误差。实验结果表明,修正的分布式光纤温度传感系统的最大测温误差从5.4℃降低到0.6℃,测温准确度有明显提高。To reduce temperature measurement error caused by the wavelengthrelated loss of Raman scattering light and extra noise of photodetector and Rayleigh noise in scattering lights of the Ramandistributed temperature sensor system,an antiStokes optical noise reduction method developed by analyzing the demodulation principle of distributed optical fiber temperaturesensing system in this paper.The optical fiber is laid according to the ring structure.The average value of the base noise following the Fresnel reflection peak in each measured antiStokes optical signal is taken as the dynamic background noise.Two sections of the optical fiber at different temperatures are used to eliminate the Rayleigh noise after the dynamic background noise.In theory,the antiStokes light noise reduction demodulation method prevents the temperature measurement error introduced by the reference Stokes light and eliminates the temperature measurement error caused by background noise and Rayleigh noise.The experimental results demonstrate that the maximum temperature measurement error of the modified distributed optical fiber temperaturesensing system is decreased from 5.4℃to 0.6℃,and the temperature measurement accuracy is significantly improved.

关 键 词：光纤光学 分布式光纤传感系统 拉曼散射 环形结构 噪声抑制 测温误差 

分 类 号：TN253[电子电信—物理电子学] O437.3[机械工程—光学工程]