改进型分布式光纤水下输气管道泄漏检测仿真分析

Simulation analysis of improved interference distributed fiber-optic underwater gas pipeline leak detection

针对现有干涉分布式光纤感测架构在系统结构复杂度与灵敏度方面的限制,通过对一种基于萨格纳克/马赫-曾德尔原理的干涉分布式光纤感测架构进行改进,仿真分析架构中的关键结构参数,确定了一种延迟光纤长度为2 km,调制器光纤为5 m,检测起点为距离法拉第旋转镜1.03 km的改进型分布式光纤感测架构.仿真结果表明,该结构能够有效地减小光信号损失,准确地定位管道泄漏点位置,从而为水下长输管道的泄漏检测提供了一种理想的感测模型架构.

To solve problems about exist interference distributed fiber-optic in system structure order of complexity and sensitivity aspect's restriction,it improved the system structure based on a Sagnac and Mach-Zehnder interference distributed fiber-optic,simulation analysis the key structural parameters of the architecture,determined a sort of improved distributed fiber-optic,which the delayed fiber length for 2 km,the modulator optical fiber length for 5 m,the origination for the detection was 1.03 km far from the Faraday rotation mirror.Simulation results show that the improved structure can effectively reduce the optical signal loss and accurate positioning pipeline leak location,so as to underwater pipeline leak detection provides an ideal model of the sensing structure.