摘要
从油气管道沿线需要进行外部入侵及泄露监测的安全需求出发,在多年分布式光纤扰动传感技术研究的基础上,结合拉曼散射理论,设计了一种简化的双路光纤传感结构以实现扰动与温度双参数的同时监测,该方案既可提高现有系统器件的利用率,又相比于单路传感,避免了脉冲光源的复杂调制,同时也消除了拉曼光和瑞利光之间可能的相互影响,实验结果表明,在4. 9 km的光纤上实现了对扰动与温度的异常监测及定位报警,定位误差不超过20 m。
For oil and gas pipelines,both external intrusion and leakage need to be monitored. After many years research on distributed optical fiber intrusion sensing technology,a simplified two-path optical fiber sensing structure was designed to monitor parameters of intrusion and temperature simultaneously,based on Rayleigh and Raman light scattering theory. The scheme could improve the utilization of the existing system components,and avoid complex modulation of the pulse light source compared with the single-path sensing,and it also reduced the possibility of mutual influence between the Raman light and the Rayleigh light. Experimental results show that over the fiber of 4. 9 km,the temperature measurement accuracy is intrinsic ±4 ℃ with the same spatial resolution of 20 m as that of intrusion monitoring.
作者
魏旭毫
邵洪峰
王夏霄
马福
WEI Xuhao;SHAO Hongfeng;WANG Xiaxiao;MA Fu(Beihang University, School of Instrumentation and Optoelectronic Engineering, Beijing 100191 , China)
出处
《激光杂志》
北大核心
2019年第3期36-39,共4页
Laser Journal
基金
国家重大仪器设备开发专项(No.2013YQ040877)
关键词
光纤传感
光时域反射技术
瑞利散射
拉曼散射
fiber optical sensor
optical time domain reflectometry
rayleigh scattering
raman scattering
