基于拉曼散射光动态校准的分布式光纤温度传感系统  

Distributed fiber optic temperature sensor based on dynamic calibration of Raman Stokes backscattering light intensity

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

机构地区：[1]合肥师范学院物理与材料工程学院,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,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,合肥230601

出　　处：《物理学报》2022年第20期25-31,共7页Acta Physica Sinica

基　　金：安徽省高校自然科学研究重点项目(批准号:KJ2019A0722,KJ2021A0909);光电探测科学与技术安徽高校联合重点实验室项目(批准号:2019GDTCZD01);电子信息系统仿真设计安徽省重点实验室重点项目(批准号:2020ZDSYSZD03);安徽省大学生创新创业训练项目(批准号: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(批准号:YZJJ2020QN3,YZJJ2022QN02)资助的课题。

摘　　要：分布式光纤温度传感(distributed temperature sensor,DTS)系统进行温度测量时,参考光斯托克斯光强度随着温度的升高而增大,使信号光反斯托克斯光与参考光斯托克斯光强度的比值减小,测量温度小于真实温度,降低系统的测温准确度.本文提出并实验验证了一种新的动态校准法修正斯托克斯光信号,可有效减小斯托克斯光导致的测温误差,提高系统的测温准确度.该方法根据参考光纤中的实时斯托克斯光强分布,模拟出对应的整条光纤在参考温度环境中的斯托克斯光强度曲线,实现斯托克斯光的温度响应修正.实验结果表明,与传统温度解调方法相比,分布式光纤温度传感系统进行斯托克斯光动态校准后测温准确度最高提升4.3℃.与瑞利噪声抑制法联用后,测温准确度提高8.9℃.本研究为DTS系统进行高温环境温度监测提供了一种新的解决方案.In a distributed fiber optic temperature sensing system,the intensity of Raman Stokes backscattering light serving as reference light increases with the increase of temperature,leading to measurement errors in the system.A novel method of dynamically calibrating Raman Stokes backscattering light intensity is proposed to improve temperature accuracy for distributed fiber optic temperature sensors.According to the real-time Stokes intensity distribution in the reference fiber,Stokes intensity curve of the whole fiber at a reference temperature is simulated,and the temperature response of Stokes light is corrected.The ratio of Raman anti-Stokes light intensity to the calculated Stokes light intensity is used to demodulate temperature along the fiber.The experimental results indicate that the temperature accuracy of the distributed optical fiber temperature sensor system after making the Stokes optical dynamic calibration is increased up to 4.3℃compared with that from the conventional method.And the accuracy of temperature measurement is improved by 8.9℃when combined with Rayleigh noise suppression method.This study provides a new solution for a distributed fiber optic temperature sensor system to monitor high temperature environment temperature.

关 键 词：分布式光纤温度传感 斯托克斯散射光 校准 测温准确度 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]