TY - JOUR
T1 - Multipath distributed acoustic sensing system based on phase-sensitive optical time-domain reflectometry with frequency division multiplexing technique
AU - Zhu, Kun
AU - Zhou, Bin
AU - Wu, Huan
AU - Shang, Chao
AU - Lu, Linyue
AU - Adeel, Muhammad
AU - Yan, Yaxi
AU - Zhao, Zhiyong
AU - Tam, Hwa Yaw
AU - Lu, Chao
N1 - Funding Information:
This work is partially supported by the National Key R&D Program of China under Grant 2018YFB1801701 and the National Natural Science Foundation of China (NSFC) under Grant U1701661 .
Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/7
Y1 - 2021/7
N2 - We propose a multipath distributed acoustic sensing (MP-DAS) system based on phase-sensitive optical time-domain reflectometry (Φ-OTDR) and frequency division multiplexing (FDM) technique. With FDM introduced to Φ-OTDR, simultaneously monitoring of multipath vibration is realized with flexible functionality. In the proposed MP-DAS system, the parameters of each path can be adjusted individually according to the path's specific monitoring requirement. A dual path Φ-OTDR system with 1 km and 22 km measurement distance is demonstrated in the experiment. Through heterodyne detection and FDM technique, both amplitude and phase information are obtained for event locating and vibration sensing in each of the two paths, with a spatial resolution of 5 m and 10 m respectively. With changing optical power and pulse width of one path, its influence on the other path is discussed and analyzed. This proposed MP-DSA system based on FDM technique provides an efficient and cost-effective way for upgrading a conventional single DAS into an integrated DAS network, which shows great potential in many applications such as modern city civil structure monitoring with different demands.
AB - We propose a multipath distributed acoustic sensing (MP-DAS) system based on phase-sensitive optical time-domain reflectometry (Φ-OTDR) and frequency division multiplexing (FDM) technique. With FDM introduced to Φ-OTDR, simultaneously monitoring of multipath vibration is realized with flexible functionality. In the proposed MP-DAS system, the parameters of each path can be adjusted individually according to the path's specific monitoring requirement. A dual path Φ-OTDR system with 1 km and 22 km measurement distance is demonstrated in the experiment. Through heterodyne detection and FDM technique, both amplitude and phase information are obtained for event locating and vibration sensing in each of the two paths, with a spatial resolution of 5 m and 10 m respectively. With changing optical power and pulse width of one path, its influence on the other path is discussed and analyzed. This proposed MP-DSA system based on FDM technique provides an efficient and cost-effective way for upgrading a conventional single DAS into an integrated DAS network, which shows great potential in many applications such as modern city civil structure monitoring with different demands.
KW - Coherent detection
KW - Distributed acoustic sensing
KW - Distributed optical fibre sensor
KW - Frequency division multiplexing
KW - Phase-sensitive OTDR
UR - http://www.scopus.com/inward/record.url?scp=85101751831&partnerID=8YFLogxK
U2 - 10.1016/j.optlaseng.2021.106593
DO - 10.1016/j.optlaseng.2021.106593
M3 - Journal article
AN - SCOPUS:85101751831
SN - 0143-8166
VL - 142
SP - 1
EP - 7
JO - Optics and Lasers in Engineering
JF - Optics and Lasers in Engineering
M1 - 106593
ER -