论文标题
在基于DR的定量分布式振动传感中，多核光纤抑制了褪色的噪声抑制
Multi-core fiber enabled fading noise suppression in ϕ-OFDR based quantitative distributed vibration sensing
论文作者
论文摘要
相干褪色被认为是基于相敏感的光频域反映量学（基于DRD）的分布式光纤传感的关键问题。在这里，我们报告了一种用多核光纤在ϕ-fdr中淡化噪声抑制的方法。通过利用每个核心反射指数分布中随机性的独立性，可以通过将加权矢量平均为雷利（Rayleigh）向后散射的痕迹施加加权矢量平均，从而有效地缓解了由于衰落现象而引起的急剧波动。通过对每个核心的外部激发兴趣的一致线性响应，具有商用七核光纤的Propsosed ϕ-OfdR的演示获得了高度敏感的定量分布式振动感测，其长度长度为2.2 nm长度为2.2 nm，沿500 M纤维沿500 M纤维的2 CM传感分辨率，对应于范围分辨率，对应于高于4E-5的高度分辨率因子。这种方法具有长距离，高灵敏度，高分辨率和褪色的稳健性，在各种实用场景中都显示出各种感测技术的有希望的潜力。
Coherent fading has been regarded as a critical issue in phase-sensitive optical frequency domain reflectometry (ϕ-OFDR) based distributed fiber-optic sensing. Here, we report on an approach for fading noise suppression in ϕ-OFDR with multi-core fiber. By exploiting the independent nature of the randomness in the distribution of reflective index in each of the cores, the drastic phase fluctuations due to the fading phenomina can be effectively alleviated by applying weighted vectorial averaging for the Rayleigh backscattering traces from each of the cores with distinct fading distributions. With the consistent linear response with respect to external excitation of interest for each of the cores, demonstration for the propsoed ϕ-OFDR with a commercial seven-core fiber has achieved highly sensitive quantitative distributed vibration sensing with about 2.2 nm length precision and 2 cm sensing resolution along the 500 m fiber, corresponding to a range resolution factor as high as about about 4E-5. Featuring long distance, high sensitivity, high resolution, and fading robustness, this approach has shown promising potentials in various sensing techniques for a wide range of practical scenarios.
