基于互相关定位法的干涉仪分析与仿真  

Research of Interferometer Based on Cross-correlation Location Method Computer Engineering and Applications

作　　者：曾羽琚[1] 陈明辉[2] 

机构地区：[1]长沙环境保护职业技术学院信息技术系,长沙410005 [2]湖南商学院教务处,长沙410205

出　　处：《计算机系统应用》2014年第1期98-102,77,共6页Computer Systems & Applications

基　　金：长沙环境保护职业技术学院教育教学课题(12JY009)

摘　　要：首次提出用时域互相关法处理Sagnac/Mach-Zehnder分布式光纤传感系统的干涉输出信号,对扰动进行检测和定位.首先对Sagnac/Mach-Zehnder分布式光纤传感系统进行了扰动检测和定位的理论分析,推导出扰动引起的干涉输出信号的表达式,利用Bessel函数展开,确定了该系统的两路干涉输出满足时域互相关的特性.在此基础上进一步分析了两路干涉信号的表达式,提出基频定位法和微分定位法两种时域互相关方法处理干涉信号,确定扰动位置.对两种扰动定位方法进行了Matlab仿真,并通过实验在多个扰动位置多次验证了两种方法的正确性.This paper proposes to process the interference outputs of the Sagnac/Mach-Zehnder interferometer by using time-domain cross-correlation method, which is a distributed optical fiber sensing system, to detect and locate the disturbance. Firstly, it gives the theoretical analysis of Sagnac/Mach-Zehnder interferometer, derives the expression for the interference outputs and uses Bessel function to expanse the expression, demonstrates the two interference outputs of the system meet the time-domain cross-correlation properties. Based on further analysis of the expression of two interference signals, it proposes two time-domain cross-correlation method by the baseband positioning method and differential positioning method to approach the interference signal to determine the disturbance location.

关 键 词：SAGNAC Mach-Zehnder分布式光纤传感系统 互相关 扰动 定位 

分 类 号：TH744.3[机械工程—光学工程]