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提出了一种新型油气管道光纤预警系统。该系统基于Mach-Zehnder干涉原理,通过检测传感系统输出的干涉信号强度变化,测得盗油事件产生的微振动,达到预警的目的。由于光纤传感器具有极高的灵敏度,因此在管线遭到破坏前就可以发出预警。分析了传感系统定位和信号频谱分析的原理并进行了现场实验。实验结果表明,本系统监测距离大于50 km,相对定位误差为2%,系统误报率小于5%,正确报警率93.57%,平均响应时间为68.3 ms。
A new oil and gas pipeline optical fiber warning system is proposed. Based on the Mach-Zehnder interference principle, the system detects the micro-vibration generated by the oil spill event by detecting the change of the intensity of the interference signal output by the sensor system, so as to achieve the purpose of early warning. Due to the extremely high sensitivity of fiber optic sensors, warnings can be issued before the pipeline is damaged. The principle of sensing system positioning and signal spectrum analysis was analyzed and field experiments were carried out. Experimental results show that the system monitoring distance is more than 50 km, the relative positioning error is 2%, the system false alarm rate is less than 5%, the correct alarm rate is 93.57% and the average response time is 68.3 ms.