【摘要】 提出了一种长距离油气管线泄漏在线监测的分布式光纤传感器.在油气管线附近并行铺设一条光缆,利用光纤作为传感器,拾取由油气管线泄漏、附近机械施工和人为破坏等事件产生的压力和振动信号.在实验室中,把工作窗口为1310nm、芯径为50/125μm的多模光纤作为传感光纤,在0 6MPa泄漏气流的作用下进行了实验.在光入射端,用光时域反射计对上述事件引发的损耗进行定位;在光输出端,用光功率计检测光功率的变化,并根据信号特征来判定事件的类型.研究结果表明,分布式光纤传感器可以对长达几十公里的管线泄漏进行监测,且定位精度在几十米之内.因此,分布式光纤传感器可用于远距离油气管线泄漏的实时在线监测.更多还原

【Abstract】 A bending distributed optical fiber sensor for detecting and lcating longdistance natural gas pipeline leakage was presented.Optical fiber, set up along the pipeline acting as sensor, acquires the signals of pressure and vibration created by some events such as the leakage, mechanical disturbance, and factitious destruction. The experiments were performed using a multimode fiber (50/125 μm) with working wavelength of 1 310 nm as a sensor in a 06 MPa stream of pipeline leakage in the laboratory. Optical timedomain reflectometry(OTDR) located the regions where optical attenuation occurred due to leakage; optical power meter acquired the transmitted power at the end of fiber, and these events could be identified according to the characteristics of signals. The experiments show that the distributed optical fiber sensor has the capacity of realtime detecting and locating leakage with an estimated accuracy of tens meters along a tens kilometerslength of natural gas pipeline.更多还原