Abstract A distributed fiber-optic sensor based on a hybrid configuration of dual-Sagnac interferometer is proposed and demonstrated. The polarization compensation module is used to stabilize the polarization state of Sagnac interferometer so that it can be used for sensing. Through the time delay estimation algorithm, two signals with a time delay can be constructed, and the vibration position can be obtained by extracting the time delay. The experimental results show that the maximum sensing distance of the sensor can reach 150 km and the positioning error is within ± 30 m. It is easy to install and can be widely used in long-distance security monitoring.

中文翻译：

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基于时延估计的双Sagnac干涉仪的150km分布式无中继光纤扰动定位传感器

摘要 提出并演示了一种基于双萨格纳克干涉仪混合配置的分布式光纤传感器。偏振补偿模块用于稳定萨格纳克干涉仪的偏振态，使其可用于传感。通过时延估计算法，可以构造两个具有时延的信号，通过提取时延得到振动位置。实验结果表明，该传感器最大感应距离可达150 km，定位误差在±30 m以内。安装方便，可广泛应用于远距离安防监控。