Paper Info
Title
Distributed acoustic sensing based on pulse-coding phase-sensitive OTDR
Abstract
Phase-sensitive optical time-domain reflectometry (Φ-OTDR), which utilizes the phase information of Rayleigh scattered lightwave inside optical fiber, could turn a fiber cable into a massive sensor array for distributed acoustic sensing (DAS), i. e., an emerging infrastructure for Internet of Things. Given a certain fiber length, there are trade-offs among the sensing bandwidth, the sensitivity and the spatial resolution. In this paper, the concept of linearization and Golay pulse-coding for heterodyne Φ-OTDR are proposed and experimentally verified for the first time. Firstly we gave a full theoretical treatment on how an intensity-coded yet phase-retrieved Φ-OTDR can be built up as a fully linear system, therefore a significant enhancement of signal to noise ratio becomes viable and the sensing bandwidth keeps equal the four-times averaging case. Secondly in the proof-of-concept experiment, submeter gauge length and nano-strain resolution were realized with 10 km sensing range, in other words, more than ten thousand sensitive sensing units were realized along the fiber. This work makes a significant step towards high-performance DAS with orders-of-magnitude performance enhancement.
Year
DOI
Venue
2019
10.1109/jiot.2018.2869474
IEEE Internet of Things Journal
Keywords
Field
DocType
Optical fiber sensors,Spatial resolution,Signal to noise ratio,Encoding,Optical fibers,Optical fiber cables
Optical time-domain reflectometer,Optical fiber,Optical fiber cable,Computer science,Sensor array,Signal-to-noise ratio,Optics,Distributed acoustic sensing,Heterodyne,Reflectometry,Distributed computing
Journal
Volume
Issue
ISSN
6
4
2327-4662
Citations 
PageRank 
References 
1
0.48
0
Authors
10
Name
Order
Citations
PageRank
Zinan Wang111.83
Bin Zhang210.48
Ji Xiong310.82
Yun Fu480248.11
Shengtao Lin510.82
Jialin Jiang611.83
Yongxiang Chen711.16
Y. Wu81178139.36
Qingyang Meng942.95
Y. Rao1046.49