利用光纤分布式传感器对长距离输油管线等高危作业区域进行安全监测已被广泛研究和应用,但在使用过程中由于各种原因导致传感光纤断裂或损坏的情况时有发生,严重制约其对被测目标的长期监测。通过分析加载光纤传感器之结构,将传感光纤沿被测长度区间分为数段并建立若干传感控制节点,在节点间设置冗余光纤并组建全光远程控制系统,为目标传感器提供具有分段控制保护的故障位置自动诊断以及传感功能自动恢复的光纤智能传感系统。对传感结构进行故障概率的模拟分析和计算表明,该结构可有效地提升传感器的生存能力。拟将该系统应用于油田长距离输油管线安全监测的分布式光纤传感系统中,并提出相应的分段保护光缆连接结构。

Distributed fiber sensor has been widely used in safety monitoring area for long-distance transmission pipe laying or other high-risk work areas. However, the breakage or damage of sensing fiber cables occurs frequently, which restricts the long-term monitoring of the monitored targets. To solve this issue, we establish an intelligent fiber sensor system with the function of self-diagnosis and self-healing, which divide the monitoring area into several regions by controlling nodes and resilient sensing fibers to accomplish the automatic fault location and recovery of sensing service. The proposed system can improve the survivability of the distributed fiber sensor according to simulation analysis results of the sensor's working situation. We use the proposed system in distributed fiber sensor system for the long-distance pipe laying monitoring project and propose the multi-section combination structure to protect fiber cable.