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通过有源相位噪声消除实现的远程光纤地震传感

Long-range fiber-optic earthquake sensing by active phase noise cancellation.

作者信息

Noe Sebastian, Husmann Dominik, Müller Nils, Morel Jacques, Fichtner Andreas

机构信息

Institute of Geophysics, ETH Zurich, 8092, Zurich, Switzerland.

Swiss Federal Institute of Metrology, METAS, 3003, Bern-Wabern, Switzerland.

出版信息

Sci Rep. 2023 Aug 26;13(1):13983. doi: 10.1038/s41598-023-41161-x.

DOI:10.1038/s41598-023-41161-x
PMID:37633995
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10460440/
Abstract

We present a long-range fiber-optic environmental deformation sensor based on active phase noise cancellation (PNC) in metrological frequency dissemination. PNC sensing exploits recordings of a compensation frequency that is commonly discarded. Without the need for dedicated measurement devices, it operates synchronously with metrological services, suggesting that existing phase-stabilized metrological networks can be co-used effortlessly as environmental sensors. The compatibility of PNC sensing with inline amplification enables the interrogation of cables with lengths beyond 1000 km, making it a potential contributor to earthquake detection and early warning in the oceans. Using spectral-element wavefield simulations that accurately account for complex cable geometry, we compare observed and computed recordings of the compensation frequency for a magnitude 3.9 earthquake in south-eastern France and a 123 km fiber link between Bern and Basel, Switzerland. The match in both phase and amplitude indicates that PNC sensing can be used quantitatively, for example, in earthquake detection and characterization.

摘要

我们展示了一种基于计量频率传播中的有源相位噪声消除（PNC）的远程光纤环境变形传感器。PNC传感利用通常被丢弃的补偿频率记录。无需专用测量设备，它与计量服务同步运行，这表明现有的相位稳定计量网络可以轻松地作为环境传感器共同使用。PNC传感与在线放大的兼容性使得能够对长度超过1000公里的电缆进行询问，使其成为海洋地震检测和预警的潜在贡献者。使用能精确考虑复杂电缆几何形状的谱元波场模拟，我们比较了法国东南部一次3.9级地震以及瑞士伯尔尼和巴塞尔之间123公里光纤链路的补偿频率的观测记录和计算记录。相位和幅度的匹配表明PNC传感可用于定量分析，例如地震检测和特征描述。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e2bb/10460440/d867a33d6e51/41598_2023_41161_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e2bb/10460440/0efd2f16db6c/41598_2023_41161_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e2bb/10460440/435f04f0b7a8/41598_2023_41161_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e2bb/10460440/437f75bd72ea/41598_2023_41161_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e2bb/10460440/d867a33d6e51/41598_2023_41161_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e2bb/10460440/0efd2f16db6c/41598_2023_41161_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e2bb/10460440/435f04f0b7a8/41598_2023_41161_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e2bb/10460440/437f75bd72ea/41598_2023_41161_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e2bb/10460440/d867a33d6e51/41598_2023_41161_Fig4_HTML.jpg

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