摘要
提出一种可用于管道安全维护的全光纤监测定位系统。系统以多个熔锥型光纤耦合器构造的双Sagnac干涉光路监测扰动信号,利用其复用段上对同一个扰动信号产生两组不同响应的特点消除监测结果的不确定性,将两组信号同时进行差分放大、快速傅里叶变换,在此基础上采用Daubechies3小波去噪的分析方法,解决扰动源特性限制问题,得到表征其位置的频响曲线。在47.401km的环路复用段上施加模拟油气管道所受到的人为侵扰,系统正确确定了这一常见随机扰动源的位置,平均误差小于100m,表明该系统能够对较长距离的管道设施进行实时监测定位。
An all-fiber monitoring and position determination system for pipe security was presented. A dual-Sagnac interferometer formed by the fused-tapered optical fiber couplers inspected the intrusion. Each Sagnac loop gave a different response to a common disturbance, and simultaneously evaluated the position. The signal processing devices of the system using differential amplifier, Fast Fourier Transform and Daubechies3 wavelet transformation techniques synchronously processed the detected signals. The system gave the eigenfrequencies with the characteristic of the disturbance＇s position and finally confirmed the position. Simulating the type of disturbance pipes suffered and forcing on the 47.401kin-long loop, the system correctly confirmed the position and the average error is less than 100m The system can be applicable for real-time monitoring the long distance pipes and performing position determination.
出处
《光电工程》
EI
CAS
CSCD
北大核心
2006年第4期72-74,共3页
Opto-Electronic Engineering
