基于分布式光纤传感器的输气管道泄漏检测方法

Method of leakage detection for gas pipelines based on distributed optic fiber sensors

针对传统方法难以精确诊断输气管道泄漏的难题,提出采用准分布式光纤B ragg光栅(FBG)传感技术实现天然气管道泄漏的在线监测技术。利用一条FBG光缆作为传感器,并行铺设在天然气管道附近,拾取管道由于泄漏、附近机械施工和人为破坏等事件产生的压力和振动信号,通过匹配光栅法和自动识别技术检测管道泄漏并进行定位。实验结果表明:该方法可以实现对天然气管道泄漏进行诊断并定位。

Aiming at the difficulty to detect leakage for gas pipelines with traditional methods,a leakage detection technology for gas pipelines based on the principle of distributed fiber Bragg grating （FBG） is proposed. FBG sensors which is set up along the pipeline, acquires the signals of pressure and vibration signals created by some events such as leakage, mechanical disturbance. Use grating matching and automatic telling technique to detect and locate leakage. The experiment shows that this method has the capacity of real time detecting and locating leakage for gas pipelines.