Optical Fibre Sensing for Offshore Renewable Energy

分布式光纤传感是一个具有很大工业相关性的主题。利用来自光纤的不同形式的反向散射来测量光纤中任何位置处的局部环境，使得周界传感、电缆监测、石油和天然气管道/井监测和智能结构的发展成为可能。Fraunhofer CAP最近的项目是将分布式声学传感（DAS）与分布式温度传感（ESTA）相结合，以创建多功能传感器系统。通过与EMEC合作，Fraunhofer CAP已经能够在海上电力电缆中展示这些技术，以首次检测电力电缆在实时动态脐带缆上的震动。在数据采集和分析的优化方面还有很多工作要做。有必要找出DAS/DAS系统的局限性--我们能否将已安装的电源电缆转换为分布式麦克风？我们如何准确地确定电缆埋深使用结合DAS？我们还想考虑其他方法，如布里渊散射测量应变和温度。这一工业研究项目将涉及建模和实验活动。积极参与合作项目，我们将致力于在安装的海上电缆上试用传感器系统。也将有机会探索其他类型的光纤传感器，如光纤布拉格光栅和长周期光栅。

Distributed optical fibre sensing is a topic of great industrial relevance. Exploiting different forms backscatter from optical fibre to measure the local environment at any position in the fibre has enabled the development of perimeter sensing, cable monitoring, oil and gas pipeline/ well monitoring and smart structures. Fraunhofer CAP have had recent projects on combining distributed acoustic sensing (DAS) with distributed temperature sensing (DTS) to create a multifunctional sensor system. Working with EMEC, Fraunhofer CAP have been able to demonstrate these techniques in marine power cables to detect power cable strumming on a live dynamic umbilical for the first time. There is much to be done in the optimisation of the data acquisition and analysis. There is a need to find the limits of the DAS/DTS systems - can we turn installed power cables into distributed microphones? How accurately can we determine cable burial depth using DTS combined with DAS? We also want to consider other methods such as Brillouin scattering to measure strain and temperature. Modelling and experimental activity would be involved in this industrial research project. Active involvement in collaborative projects will be expected and we will aim to trial sensor systems on installed offshore cabling. There will also be the opportunity to explore other types of fibre sensors such as fibre Bragg gratings and long period gratings.