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首页> 外文期刊>Journal of Lightwave Technology >Fading Noise Suppression in Φ-OTDR Based on Nearest Neighbor Analysis
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Fading Noise Suppression in Φ-OTDR Based on Nearest Neighbor Analysis

机译：基于最近邻分析的φ-OTDR衰落噪声抑制

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摘要

Phase sensitive optical time domain reflectometry (Phi-OTDR) has been widely used in the precise acquisition of the vibration signal along the sensing optical fiber, and has attracted more andmore interest. However, polarization fading and coherent fading usually lead to the phase hopping of the recovered signal, thus it is difficult to realize the continuous measurement of vibration, especially the low frequency vibration. The polarization diversity and multi-frequency detection schemes which are usually used to solve the above problems need additional hardware, thus increasing the cost and complexity of the system. In this article, we propose a statistical method based on nearest neighbor analysis. For each interrogation fiber separation, the phases of the sub-separations are evaluated and selected to reconstruct the vibration. In the experiment, the vibrations with frequencies as low as 0.2 Hz are loaded on the fiber and recovered. The results show that themethod can effectively suppress the phase hopping, correct distorted vibration and improve the performance of low frequency vibration measurement of Phi-OTDR system on the basis of only numerical calculation.
机译：相敏光学时域反射区（PHI-OTDR）已广泛用于沿着传感光纤的精确获取振动信号，并且吸引了更多的兴趣。然而，极化衰落和相干衰落通常导致回收信号的跳跃，因此难以实现振动的连续测量，尤其是低频振动。通常用于解决上述问题的偏振分集和多频检测方案需要额外的硬件，从而提高系统的成本和复杂性。在本文中，我们提出了一种基于最近邻分析的统计方法。对于每个询问纤维分离，评估子分离的相位以重建振动。在实验中，在纤维上加载频率低至0.2Hz的振动并回收。结果表明，本体验中可以有效地抑制跳跃，纠正扭曲振动，并在仅数值计算的基础上提高PHI-OTDR系统的低频振动测量的性能。

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