基于分布式光纤监测的压力钢管模拟泄漏室内试验

Distributed optical fiber monitoring in simulated leakage test on pressure steel pipe

实际运行的压力钢管可能存在腐蚀进而破裂、泄漏的隐患,因此需要开展在役的压力钢管实时安全监测方法研究,实现对泄漏的及时定位、报警。本文基于F-OTDR光纤干涉原理的振动监测方法,开展了模拟压力钢管泄漏的室内试验,系统研究不同泄流条件下的分布式光纤的检测结果。试验结果表明,随着泄流孔孔径的增加和泄流量的增加,泄漏引起的振动信号强度增加,但是由于系统初始扰动能量的存在,仅依据数据分析,难以判断极小泄流量引起的振动信号。本实验中,当泄流量大于1.00L/s时,分布式光纤检测效果较好。

The pressure steel pipe in service could be broken by corrosion and lead to dangerous leakage.Hence it is necessary to develop a real time monitoring method to locate the leaks in pipes and alarm in time.This study carried out a series of indoor experiments that simulated leakage in a pressure steel pipe,using the vibration monitoring method based on the?-OTDR optical fiber interference principle and systematically studied its effectiveness under different leakage conditions.The experimental results imply that the detected vibration signal intensity become larger as the increase of the size of leak holes and discharge of flow.However,due to the initial vibration energy in system,the vibration signal by extreme small leakage can hardly be distinguished according to monitoring data.In this experiment,the distributed optical fiber can be effective when the leakage is larger than1.00L/s.