为检验光纤传感检测技术应用效果,结合山东省天然气管道有限责任公司胶州站到胶西站天然气管道现场实际情况,利用与天然气管道同沟敷设的光缆对光纤振动和温度传感检测技术的效能进行评价,得出相关结论并提出了系统优化建议。效能评价结果表明：分布式光纤振动传感系统能实时灵敏地检测到电钻打孔、挖掘机挖土、铁锨铲土、锤子捶地、火车驶过和重型车经过等6种入侵的振动信息并准确进行定位,定位误差为20 m,且对其中几种入侵振动信号的识别率较高;在实验室理想环境下,胶州站到胶西站间光缆检测的最大距离可达24 km,但在实际环境中,由于光纤的熔接等原因,该段光纤可稳定检测的有效距离约15 km,此外,在温度发生变化后,系统能够进行准确地检测、定位和报警。光纤传感检测技术可以准确定位天然气管道入侵位置,实现泄漏状态的实时检测、预警、报警和定位,在一定程度上能对天然气管道进行有效防护。

Based on the actual situation of natural gas pipeline from Jiaozhou station to Jiaoxi station, this paper evaluates the efficiency of optical fiber vibration and temperature sensing technology by using the fiber optic cable laid in the same trench with the pipeline, draws the relevant conclusions and puts forward suggestions for system optimization.The results of effectiveness evaluation show that the distributed optical fiber vibration sensing system can detect and locate accurately the vibration information of 6 kinds of intrusions, such as electric drilling, excavation and shovelling, hammer blowing, train and heavy vehicle running, with positioning error less than 20 meters.Under lab conditions,the detection distance between Jiaozhou station and Jiaoxi station can reach 24km, but in the actual environment, due to the fusion of optical fiber and other factors, the effective range of the stable detection is about 15km.In addition, the system can detect, locate and alarm accurately when temperature change occurs. The optical fiber sensor detection technology can locate accurately the intrusions and realize real-time monitoring, early-warning, alarm and positioning for leakage, and provide protection for pipeline to certain extent.