PRI Distinguished Seminar Series on 22 Apr 2024 (Mon) - Optical Fiber Distributed Acoustic Sensors: Challenges and Solutions

^_Topic

Optical Fiber Distributed Acoustic Sensors: Challenges and Solutions

^_Abstract

DAS, the distributed acoustic sensor, is a fiber-optic device for distributed sensing of dynamic strain with high fidelity. It is an amazing technology suitable for long-range and large-area application in various areas, such as geoscience and geoengineering, oil and gas industry, structural health monitoring, and perimeter security. In this tutorial, sensing principles and positioning mechanisms involved in DAS systems are reviewed, and different DAS schemes compared. Two major challenges with conventional phase sensitive OTDR DAS systems, i.e., the trade-off between spatial resolution and sensing length and the dead-zone due to interference fading, are analyzed. High performance DAS technology based on pulse-compression and rotated-vector-summation algorithms is explained, which are newly developed to answer the above challenges. Then several application demonstrations in geophysical exploration, seismic measurement, and perimeter security are introduced. Finally, possible research and development trends are discussed.

^_Biography

Prof. Zuyuan HE received BS and MS degrees in Electronic Engineering from Shanghai Jiao Tong University, China, in 1984 and 1987, respectively, and PhD degree from University of Tokyo, Japan, in 1999. He joined Nanjing University of Science and Technology, China as a Research Associate in 1987, and became a Lecturer in 1990. In 1999, he became a Research Associate in the University of Tokyo. In 2001, he joined CIENA Corporation, Maryland, USA, as a Lead Engineer heading the optical testing and optical process development group. He returned to the University of Tokyo as a Lecturer in 2003, then became an Associate Professor in 2005 and a full Professor in 2010. He is now a Chair Professor in Electronic Engineering, Shanghai Jiao Tong University. His research interests include optical sensing, optical interconnects, and optical computing. He co-authored about 500 papers in peer-refereed journals and international conferences. Prof. HE is an OPTICA fellow and a senior member of IEEE. He worked as an associate editor of Journal of Lightwave Technology 2013-2019 and served as TPC members in a variety of international conferences, such as CLEO, OFC, and OFS, and as the General Chair of ACP 2014 and APOS 2016, respectively.