摘要
搭建了基于布里渊散射光时域分析技术的应变测量系统,采用七芯光纤作为分布式形状传感器,通过测量七个纤芯在弯曲时的布里渊散射谱,验证了七芯光纤偏芯之间每两个对称芯所受应变值相等且互为相反数的特点。对比七芯光纤中间芯与偏芯的布里渊增益谱,测得偏芯在不同弯曲半径下的布里渊频移变化,得到偏芯在每个位置受到的应变值。利用并行传输标架形状重构算法对七芯光纤在曲率直径为0.112 m和0.052 m时的形状进行了重构,当曲率直径为0.112 m时,曲率重构误差为0.375%。
In recent years,optical fiber shape sensing technology has been widely studied in various fields,and has been widely used in robot,medical,aerospace,industrial equipment structure monitoring and submarine cables.With the change of application scenarios and the gradual improvement of measurement performance requirements,the research needs of optical fiber shape sensing technology are becoming increasingly urgent.At present,the research on fiber shape sensing is mainly divided into two directions.One is the shape sensing technology based on FBG,which takes advantage of the wavelength drift of FBG under strain and realizes shape measurement by writing FBG on multi-core fiber,which has the advantages of high precision and simple data processing.In this direction,some scholars have done more in-depth research,but this technology is limited by the number and interval of FBG writing,and cannot achieve long-distance distributed shape measurement.The other direction is the shape sensing based on the distributed optical fiber measurement system.As a medium of shape sensing technology,optical fiber is small in size,light in weight,and has strong electromagnetic interference resistance and corrosion resistance.It can be either a transmission medium or a sensing medium.When the light wave is transmitted in the optical fiber,the optical intensity,phase,frequency and other parameters of the optical fiber will change with the change of environmental parameters such as strain and temperature.The data processing equipment is used to demodulate the modulated light,and then the information of strain and temperature of the optical fiber is obtained.In this paper,the Brillouin scattering in the fiber is used to reconstruct the shape of the fiber or the measured object in contact with it,and the strain change values of more than two fiber cores in the shape sensor are measured at the same time.Then the shape reconstruction algorithm is used to reconstruct the shape of the sensor or the measured object.In this paper,the BOTDA system is
作者
刘紫娟
武佳琪
张立欣
李永倩
王健健
王宽
LIU Zijuan;WU Jiaqi;ZHANG Lixin;LI Yongqian;WANG Jianjian;WANG Kuan(College of Electronics and Communication Engineering,North China Electric Power University(Baoding),Baoding 071003,China;Hebei Key Laboratory of Electric Power IoT Technology,College of Electronic and Communication Engineering,North China Electric Power University(Baoding),Baoding 071003,China;Baoding Key Laboratory of Optical Fiber Sensing and Optical Communication Technology,College of Electronic and Communication Engineering,North China Electric Power University(Baoding),Baoding 071003,China)
出处
《光子学报》
EI
CAS
CSCD
北大核心
2024年第4期95-103,共9页
Acta Photonica Sinica
基金
国家自然科学基金(Nos.62205105,62171185,52177141)
中央高校基本科研业务费专项基金项目(No.2022MS079)。
关键词
形状传感
布里渊散射光时域分析
七芯光纤
并行传输标架
Shape sensing technology
Optical time domain analysis of Brillouin scattering
Seven-core fiber
Parallel transmission standard frame
