Underwater large-area high resolution monitoring by Distributed Optical Fibre Acoustic Sensors

分布式光纤声传感器水下大面积高分辨率监测

• 批准号: NE/T005890/1
• 负责人: Gilberto Brambilla
• 金额: $ 30.82万
• 依托单位: University of Southampton
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FT005890%2F1
• 关键词: Underwater; large; area; resolution; monitoring

A variety of problems in environmental science involve determining the location and time of origin of acoustic or seismic signals. Various marine species including whales may be tracked by triangulating their vocalisations. Active faulting and magma intrusion beneath the seabed may be located by tracking the associated seismicity. Similar approaches may be used to track gas escaping through the seabed, which is now important in the context of sub-seabed carbon capture and storage (CCS), where it is important to verify that stored gas is not escaping back to the seabed. Currently in all of these applications, sound is detected by an array comprising a relatively small number (typically a few to a few tens) of point detectors, that may be towed or (more commonly) deployed on or near the seabed. Optical-fibre Distributed Acoustic Sensing (DAS) is a new technology that allows acoustic measurements to be made at an unlimited number of locations along a fibre, with a trade-off between measurement density and sensitivity. The fibre can also be manufactured relatively cheaply and at today's market prices telecom fibres coated with a polymer layer costs less than 1p per metre. Even with fibres are engineered with additional armouring to resist the weight of vehicles passing on them, their cost only increases to a few pounds per metre. Thus, this technology has the potential to locate and quantify sound sources in and beneath the ocean with much greater accuracy, and potentially much lower cost, than hitherto possible. Deployment of this technology in the ocean is limited by poor understanding of the coupling between acoustic waves and a DAS fibre within the water column or resting on the ocean floor. In this feasibility study, we propose to use a DAS system manufactured in Southampton, which can be specifically tailored for the monitoring of underwater acoustic signals and operate at frequencies commonly not used in commercial systems, to reconstruct a 3D map of acoustic fields in the ocean. Our approach will be to firstly determine the relationship between an acoustic signal in the ocean and the signal generated in the DAS fibre laid on the seabed. We will then determine a 3D model of the acoustic sources from the sensing enabled by the seabed fibre. Our next step is to then determine how to adapt and apply DAS technology so that it is suitable for detecting, locating and quantifying acoustic noise sources in the ocean. We will do some simple tests of the new technology in test tanks and in the marine environment (a dock within the port of Southampton). This project will build on research currently funded by NERC, EPSRC, Carbon Trust, the Royal Academy of Engineering and the Royal Society to provide a novel distributed acoustic sensor network capable of high-resolution 3D detection and analysis of underwater acoustic sources

环境科学中的各种问题涉及确定声学或地震信号的起源位置和时间。包括鲸鱼在内的各种海洋物种可以通过三角测量它们的发声来跟踪。活动断层和岩浆侵入海底下可以通过跟踪相关的地震活动来定位。可以使用类似的方法来跟踪通过海床逸出的气体，这在海床下碳捕获和储存的背景下现在是重要的，在海床下碳捕获和储存的背景下，重要的是核实储存的气体没有逸出回到海床。目前，在所有这些应用中，通过包括相对少量（通常几个到几十个）点检测器的阵列来检测声音，所述点检测器可以被拖曳或（更常见地）部署在海床上或海床附近。光纤分布式声学传感（DAS）是一种新技术，它允许在光纤沿着无限数量的位置进行声学测量，并在测量密度和灵敏度之间进行权衡。这种光纤的制造成本也相对较低，按目前的市场价格，涂有聚合物层的电信光纤每米的成本不到1便士。即使纤维被设计成具有额外的铠装以抵抗经过它们的车辆的重量，它们的成本也只增加到每米几磅。因此，这项技术有可能定位和量化海洋中和海洋下的声源，其精度要高得多，成本可能要低得多。在海洋中部署这项技术受到限制，因为对声波与水柱内或海底DAS光纤之间的耦合了解不足。在这项可行性研究中，我们建议使用在南安普顿制造的DAS系统，该系统可以专门用于监测水下声学信号，并在商业系统中通常不使用的频率下工作，以重建海洋声场的3D地图。我们的方法将是首先确定海洋中的声学信号与铺设在海底的DAS光纤中产生的信号之间的关系。然后，我们将通过海底光纤实现的传感来确定声源的3D模型。我们的下一步是确定如何适应和应用DAS技术，使其适用于检测，定位和量化海洋中的声学噪声源。我们将在试验水池和海洋环境（南安普顿港口内的一个码头）中对新技术进行一些简单的测试。该项目将建立在目前由NERC，EPSRC，Carbon Trust，皇家工程学院和皇家学会资助的研究基础上，以提供一种新型的分布式声学传感器网络，能够对水下声源进行高分辨率3D检测和分析

项目成果

An analysis of railway track behaviour based on distributed optical fibre acoustic sensing

• DOI: 10.1016/j.ymssp.2020.106769
• 发表时间: 2020-08-01
• 期刊: MECHANICAL SYSTEMS AND SIGNAL PROCESSING
• 影响因子: 8.4
• 作者: Milne, David;Masoudi, Ali;Le Pen, Louis
• 通讯作者: Le Pen, Louis

Long Range Raman-Amplified Distributed Acoustic Sensor Based on Spontaneous Brillouin Scattering for Large Strain Sensing.

• DOI: 10.3390/s22052047
• 发表时间: 2022-03-06
• 期刊: Sensors (Basel, Switzerland)
• 作者: Bakhtiari Gorajoobi S;Masoudi A;Brambilla G
• 通讯作者: Brambilla G

Multi-parameter optical gauge based on mode coupling effect in asymmetric index multi-core fibres

• DOI: 10.1016/j.optlaseng.2022.107047
• 发表时间: 2022
• 期刊: Optics and Lasers in Engineering
• 影响因子: 4.6
• 作者: O. Arrizabalaga;Q. Sun;Timothy Lee;J. Zubía;Javier Velasco Pascual;I. Ocáriz;A. Schülzgen;R. Amezcua-correa;G. Brambilla;M. Beresna

Surface deployment of DAS systems: Coupling strategies and comparisons to geophone data

DAS 系统的地面部署：耦合策略以及与地震检波器数据的比较

• DOI: 10.1002/nsg.12232
• 发表时间: 2022
• 期刊: Near Surface Geophysics
• 影响因子: 1.6
• 作者: Harmon N