基于光纤压力传感器的管道监控系统研究

针对运输管道埋设于土壤中面临的泄漏或堵塞点难发现、难定位的问题,结合光纤压力传感器高灵敏度、高抗干扰的特性,设计了一种基于光纤压力传感器的管道监控系统。系统采用包覆有合适热膨胀系数材料的单模光纤组成的偏振型压力传感器,能很好地克服外界环境温度扰动;采用模块化设计的压力敏感探头以20 m间距均布于管线上,形成信号点阵列源;结合点阵列数据重构与插值定位算法确定故障点的位置。结果表明:该系统的光纤压力传感器可有效克服温度变化对传感测量的不良影响,5.5 km范围内对故障点的定位精度在1 m内。

Research of pipeline monitoring system based on fiber optic pressure sensor

For the problem that it is difficult to find and locate the leakage or the blockage of the pipelines buried in the soil, combined with fiber optic pressure sensor with high sensitivity, high anti-jamming feature, a pipeline monitoring system was designed based on fiber optic pressure sensor. It used polarimetric pressure sensor which consisted of single mode fiber optic coated with a suitable thermal expansion coefficient of the material to overcome ambient temperature perturbation well. The pressure sensitive probes with modular design were distributed in pipeline every 20 meters to form an array of source signal point. Combined with lattice array data reconstruction and interpolation positioning algorithm to determine the location of faults. The results indicate that the system of fiber optic pressure sensor can effectively overcome the adverse effects of temperature changes on the sensor measurement. Within the range of 5.5 km, the positioning accuracy of fault point is within 1 m.