 Prof. Venugopalan Pallayil, National University of Singapore
Personal profile: Principal Research Fellow, Acoustic Research Lab, Tropical Marine Science Institute, National University of Singapore, 18 Kent Ridge Road, Singapore -119227
Venugopalan Pallayil earned a post graduate degree in physics and a PhD in Microwave Electronics both from the Cochin University of Science and Technology (CUSAT), India in 1981 and 1992 respectively. He served as an R&D Scientist in the Defence Research and Development Organisation (DRDO) in India for 11 years before moving to Singapore in 1998 to take up a Research Fellow position at the National University of Singapore (NUS). He is currently a Principal Research Fellow and Deputy Head at the Acoustic Research Laboratory, Tropical Marine Science Institute, National University of Singapore (NUS). He has led many successful projects while in NUS and one of his projects, Remotely Operated Mobile Ambient Noise Imaging (ROMANIS) won the prestigious Defence Technology Prize in 2004 for the best group project. He has been part of many international collaborations including Scripps Institute of Oceanography (SIO, USA), Woods Hole Oceanographic Institute (WHOI, USA), Applied Physics Laboratory, University of Washington (APL-UW, USA) and Centre for Marine Research and Experimentation (CMRE), Italy. His research activities focussed on sensing and monitoring of underwater sound and ambient noise characterisation. Recently his interest shifted to Distributed Acoustic Sensing (DAS) and will be working on a project on underwater application of DAS.
Venu Pallayil is a senior member of IEEE and serves on the Oceanic Engineering Society Executive Committee. He has also served as Vice-President of Technical Activities and is currently serving as VP for OCEANS conferences. He is a member of the Board of Directors for IIAV and also a member of the Society of Acoustics, Singapore.
Presentation title: Distributed acoustic sensing – underwater applications
Abstract: Distributed Acoustic Sensing, or DAS as it is often referred to, is a novel technology that uses fiber optic cables for sensing and monitoring vibrations in any environment. The technology relies on Raleigh Scattering, an imperfection in the usual fibre optic communication cable. Its potential has been demonstrated successfully in many applications such as sensing and classifying traffic vibrations, in seismology, pipeline fault detection applications and even in underwater detection and classification of acoustic sources. Unlike traditional microphone and hydrophone arrays made of discrete sensors, long sections of the fibre optic cable can act as a dense and continuous array of thousands of sensors providing exceptional spatial and temporal resolution for sensing, localising, and classification. This technology offers robust, large scale and relatively low-cost sensing solution. They are free from electromagnetic interference, no requirement of internal electronics, free from corrosion, robust to high temperature and still provide the required sensitivity. In this a review of the DAS technology and its selected applications in the areas underwater detection and localization will be presented. The talk will also address emerging interrogator technologies and customized cables for sensing.
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