一种融合Φ-OTDR和MZI的PCCP断丝监测系统

A Broken Wire Detection System of PCCP Pipeline Based onΦ-OTDR and MZI

设计了一种融合相位敏感型光时域反射计(Φ-OTDR)和马赫-曾德尔干涉仪(MZI)的预应力钢筋混凝土管(PCCP)断丝监测系统。通过引入优化的IQ解调算法,减少了40%以上的数据运算量。实验结果证明该系统的单端测量距离不低于20 km,频率响应不低于20 kHz,空间定位误差在±2 m以内,具备长距离定位断丝故障和分辨振动事件特征频率的能力,为PCCP的全生命周期在线结构健康监测提供了一种可靠的技术手段。

A broken wire detection system of prestressed concrete cylinder pipe(PCCP)pipeline combined with phase-sensitive optical time domain reflectometry(@-OTDR)and Mach-Zehnder in-terferometer(MZI)which reduced the amount of data computation by 40%through inducing optimized in-phase quadrature(IQ)demodulation algorithm was designed.The results of the experiment showed 20 kHz frequency response and±2 m spatial positioning error over 20 km long fiber for singleend measurement which indicated the system could position broken wire incidents along long distance and distinguish characteristic frequencies of vibration incidents.The proposed method provided a reliable technical means for online structure health detection with full lifecycle coverage of PCCP pipeline.