Distributed Acoustic Sensing Based on Multi-Core Fiber
Distributed Acoustic Sensing Based on Multi-Core Fiber
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DOI：
10.3788/aos202141.0706003
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发表时间：
2021-04-01
影响因子：
1.6
通讯作者：
Cai Haiwen
中科院分区：
文献类型：
--
作者：
Gu Jinfeng;Lu Bin;Cai Haiwen
在本研究中，我们在多芯光纤中使用多个独立的并行空间通道来实现空间分集，以解决基于传统单模光纤的分布式光纤声传感系统的信号衰落和信噪比有限的问题。我们利用扇入和扇出模块在多芯光纤的四芯中实现信号的独立传输和集中接收，并采用相干聚合的方式对多个信号进行有效的聚合。实验结果表明，与优化后的单模光纤系统相比，该系统重构了良好的外部干扰信号，抑制了信号的衰落，并将本底噪声降低了5.2 dB。该传感器具有高水平的性能：最低本底噪声为85 dB，带宽为10 kHz。
In this study, we use multiple independent parallel spatial channels in multi -core fibers to achieve spatial diversity in solving the signal fading and limited signal-to-noise ratio of distributed fiber acoustic sensing systems based on traditional single-mode fibers. We use the fan -in and fan -out modules for independent transmission and centralized reception of signals in four cores of the multi-core fiber, and multiple signals can be aggregated effectively using a coherent aggregation method. The experimental results show a well -reconstructed external disturbance signal, suppressed signal fading, and reduced noise floor by 5.2 dB compared with that of the optimized single-mode fiber system. The sensor exhibits high-level performance: lowest noise floor of 85 dB and bandwidth of 10 kHz.