提高布里渊光时域反射仪频移定位精度的二次寻峰算法  

Quadratic Peak-Seeking Algorithm to Improve The Frequency Shift Positioning Accuracy of Brillouin Optical Time Domain Reflectometer

作　　者：陈映恺 陈理平 郑永红 高波 李拥政 付林林 刘鑫煜 马丁忆 高浩然 黄秋茗 郭林峰 Xu Xiaomin Chen Yingkai;Chen Liping;Zheng Yonghong;Gao Bo;Li Yongzheng;Fu Linlin;Liu Xinyu;Ma Dingyi;Gao Haoran;Huang Qiuming;Guo Linfeng;Xu Xiaomin(School of Physics and Optoelectronic Engineering,Nanjing University of Information Science&Technology,Nanjing 210044,Jiangsu,China;China Railway(Shanghai)Investment Group Co.,Ltd.,Shanghai 200126,China;China Railway No.3 Group East China Construction Co.,Ltd.,Nanjing 211153,Jiangsu,China;Nanjing Metro Construction Co.,Ltd.,Nanjing 210019,Jiangsu,China;China Railway Tunnel Group No.2 Co.,Ltd.,Langfang 065200,Hebei,China;Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean,Nanjing 210044,Jiangsu,China;Department of Engineering,University of Cambridge,Cambridge CB21PZ,United Kingdom)

机构地区：[1]南京信息工程大学物理与光电工程学院,江苏南京210044 [2]中铁(上海)投资集团有限公司,上海200126 [3]中铁三局集团华东建设有限公司,江苏南京211153 [4]南京地铁建设有限责任公司,江苏南京210019 [5]中铁隧道集团二处有限公司,河北廊坊065200 [6]江苏省大气海洋光电探测重点实验室,江苏南京210044 [7]剑桥大学工程系,英国剑桥CB21PZ

出　　处：《激光与光电子学进展》2024年第15期155-164,共10页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(62175113);江苏省重点研发计划(BE2022076)。

摘　　要：工程应用对布里渊光时域反射仪的使用不断提出实际需求:如何精准确定应变/温变的起始位置,便于快速修复节约人力物力成本,尤其是在地下工程、海下工程等无法直接观察的复杂情况下,对于光纤沿线频移起始位置的精准确定显得尤为重要。对基于寻峰算法和短时傅里叶变换的布里渊光时域反射仪中获取频谱的算法进行改进,提出一种新的二次寻峰算法,通过判断布里渊增益谱中的峰值情况来计算温变/应变起始点与终止点。在脉冲宽度为100 ns、监测距离为1800 m的情况下,50 m温变段的起始点与终止点定位误差为0.4 m,在2000 m的探测距离上实现了1 m的空间分辨率。该算法在不增加运算时间和光电器件的基础上,提高了布里渊光时域反射仪对温度起始点和长度定位的准确性。与使用寻峰算法的布里渊光时域反射仪相比,使用二次寻峰算法的布里渊光时域反射仪具有更强的实用性与更高的性价比。The practical demand for the use of Brillouin optical time-domain reflectors in engineering applications is constantly being raised:how to accurately determine the starting position of strain/temperature change,facilitate rapid repair,save manpower and material costs,especially in complex situations such as underground engineering and underwater engineering that cannot be directly observed,the precise determination of the starting position of frequency shift along the fiber optic line is particularly important.An improvement is made on the algorithm for obtaining spectrum in Brillouin optical time-domain reflectometer based on peak finding algorithm and short-term Fourier transform.A new quadratic peak finding algorithm is proposed,which calculates the starting and ending points of temperature/strain by judging the peak situation in the Brillouin gain spectrum.In the case of a pulse width of 100 ns and a monitoring distance of 1800 m,the positioning error of the starting and ending points of the 50 m temperature range is 0.4 m,achieving a spatial resolution of 1 m at a detection distance of 2000 m.This algorithm improves the accuracy of the Brillouin optical timedomain reflectometer in locating the temperature starting point and length without increasing the computational time and optoelectronic devices.Compared with the Brillouin optical time-domain reflectometer using peak finding algorithm,the Brillouin optical time-domain reflectometer using secondary peak finding algorithm has stronger practicality and higher costeffectiveness.

关 键 词：布里渊光时域反射仪 短时傅里叶变换 频移 定位 算法优化 

分 类 号：O437.2[机械工程—光学工程]