TY - JOUR
T1 - Simultaneous Distributed Vibration and Temperature Sensing Using Multicore Fiber
AU - Dang, Yunli
AU - Zhao, Zhiyong
AU - Wang, Xuefeng
AU - Liao, Ruolin
AU - Lu, Chao
N1 - Funding Information:
This work was supported in part by the National Key Research and Development Program of China under Grant 2017YFB0405500, in part by the National Natural Science Foundation of China under Grant 61435006 and Grant U1701661, and in part by the GRF under Grant PolyU 152168/17E and Grant PolyU 152658/16E of research grant council, Hong Kong SAR, and 1-ZVGB, 1-YW3G, and 4-BCCK of the Hong Kong Polytechnic University.
Publisher Copyright:
© 2013 IEEE.
PY - 2019/10
Y1 - 2019/10
N2 - Distributed optical fiber sensing that enables simultaneous vibration and temperature monitoring is demonstrated in this work, which is achieved by implementing polarization optical time-domain reflectometry (P-OTDR) and Raman optical time-domain reflectometry (ROTDR) respectively through space-division multiplexed (SDM) configuration in different cores of a multicore fiber (MCF). Optimized system setup is obtained in the proposed hybrid system, where only one laser source is used, and the generated pulse is shared by the two reflectometers. Owing to the reason that separate interrogation fiber cores are used by the two reflectometers, the proposed hybrid system allows for simultaneous measurements of spontaneous Raman and Rayleigh scattering signals, thus it no longer suffers from the incompatible pump power levels issue, which results from different pump power demands, and hinders the implementation of the hybrid system in single mode fiber due to the fiber nonlinear effects imposed restriction. In addition, in order to extend the sensing range, we also explore the employment of wavelet transform denoising technique in the improvement of signal-to-noise ratio of ROTDR measurement. Eventually, simultaneous distributed vibration and temperature sensing in 5.76 km sensing range with 3 m spatial resolution and 0.57 °C temperature uncertainty has been demonstrated. The proposed hybrid sensing system has the outstanding advantage of high reliability, since the cross-sensitivity issue is effectively mitigated, which shows great potential for pipeline monitoring in oil and gas industry.
AB - Distributed optical fiber sensing that enables simultaneous vibration and temperature monitoring is demonstrated in this work, which is achieved by implementing polarization optical time-domain reflectometry (P-OTDR) and Raman optical time-domain reflectometry (ROTDR) respectively through space-division multiplexed (SDM) configuration in different cores of a multicore fiber (MCF). Optimized system setup is obtained in the proposed hybrid system, where only one laser source is used, and the generated pulse is shared by the two reflectometers. Owing to the reason that separate interrogation fiber cores are used by the two reflectometers, the proposed hybrid system allows for simultaneous measurements of spontaneous Raman and Rayleigh scattering signals, thus it no longer suffers from the incompatible pump power levels issue, which results from different pump power demands, and hinders the implementation of the hybrid system in single mode fiber due to the fiber nonlinear effects imposed restriction. In addition, in order to extend the sensing range, we also explore the employment of wavelet transform denoising technique in the improvement of signal-to-noise ratio of ROTDR measurement. Eventually, simultaneous distributed vibration and temperature sensing in 5.76 km sensing range with 3 m spatial resolution and 0.57 °C temperature uncertainty has been demonstrated. The proposed hybrid sensing system has the outstanding advantage of high reliability, since the cross-sensitivity issue is effectively mitigated, which shows great potential for pipeline monitoring in oil and gas industry.
KW - distributed temperature sensing
KW - distributed vibration sensing
KW - Multicore fiber
KW - space-division multiplexing
UR - http://www.scopus.com/inward/record.url?scp=85078251053&partnerID=8YFLogxK
U2 - 10.1109/ACCESS.2019.2948213
DO - 10.1109/ACCESS.2019.2948213
M3 - Journal article
AN - SCOPUS:85078251053
SN - 2169-3536
VL - 7
SP - 151818
EP - 151826
JO - IEEE Access
JF - IEEE Access
M1 - 8876632
ER -