基于二次相关算法的双M-Z光纤传感器的定位方法  

A Quadratic Correlation Method for Vibration Localization Based on Dual M-Z Fiber Sensor

作　　者：杨顺智[1] 张志勇[1] 邵理阳[1] 闫连山[1] 

机构地区：[1]西南交通大学信息科学与技术学院信息光子与通信研究中心,成都610031

出　　处：《光子学报》2017年第7期63-68,共6页Acta Photonica Sinica

基　　金：国家自然科学基金面上项目(No.61475128);科技部国际合作专项(No.2014DFA11170)资助~~

摘　　要：双马赫-曾德干涉仪型分布式光纤传感系统因灵敏度高而易受环境噪声及系统噪声的影响,使得利用直接互相关算法计算扰动信号位置存在较大误差.采用二次互相关算法,先对两路接收信号做互相关运算,再与其中一路信号的自相关结果做互相关运算,通过对两路信号的时延估计对扰动信号定位,减小了噪声带来的误差并提高计算准确度.对该算法进行了理论仿真和分析,搭建了实验装置进行了实验验证.实验结果表明,与采用直接互相关定位算法结果比较,采用本文算法能够有效提高系统对扰动信号的定位准确度,且具有较高的实时性.The dual Mach-Zehnder interferometer-type distributed optical fiber sensing system is susceptible to environmental noise and system noise due to its high sensitivity, which makes a large error in calculating the position of the disturbance signal by direct cross correlation algorithm. The quadratic cross correlation algorithm was used to process the two received signals, and then process the autocorrelation of one signal. The disturbance signal was located by estimating the delay of the two signals. With the improved method, it can reduce the error caused by noise and improve the calculation accuracy. The theoretical simulation and analysis of the algorithm were carried out, and the experimental device was experimentally verified. The experimental results show that compared with the results of using the direct correlation algorithm, the proposed algorithm can effectively improve the positioning accuracy of the disturbance signal and has higher real-time performance.

关 键 词：分布式光纤传感器 定位技术 二次互相关 时延估计 周界防护 

分 类 号：TP212.1[自动化与计算机技术—检测技术与自动化装置] TP274.2[自动化与计算机技术—控制科学与工程]