博信光学元件超市 / 2014-05-05
针对长输管道的实时监测和周界的安全预警, 建立基于双Sagnac干涉仪的分布式光纤传感安全预警系统, 包括双Sagnac干涉仪的光路系统和基于LabVIEW平台的控制与检测软件。分析了管道破坏和周界入侵等产生的外界扰动信号对光相位信号的调制原理和利用频域幅值法的定位原理, 并研究了脉冲扰动信号和连续扰动信号的过零数分布情况。基于以上原理, 开发了报警算法、定位算法和外界扰动类型判别算法软件, 并进行了实验研究。实验结果表明, 该安全预警系统可实现外扰动的实时监测、定位和扰动类型判别功能, 具有定位精度较高、运行稳定可靠、操作便捷等优点, 在工程中具有良好的应用前景。
Aiming at real-time monitoring of the long distance pipeline and security warning of perimeter, distributed fiber sensing security early warning system based on dual-Sagnac interferometer is built, including: dual-Sagnac interferometer optical path system and control and detect software based on LabVIEW platform. The optical phase modulation principle of external disturbance signals generated by pipeline damage and perimeter intrusion and locating principle by amplitude of frequency domain method are analyzed. The zero-crossing number distribution of impulse disturbance signal and continuous disturbance signal is studied. The software of warning algorithm, locating algorithm and signal discriminating algorithm based on the principle is developed and studied experimentally. The results of experiment show that the system can realize real-time monitoring, locating and signal discriminator of the external disturbance. The system has the advantages of high positioning accuracy, stability and reliability and easy operation, and a wide application prospects in engineering.
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