Distributed fiber sparse-wideband vibration sensing by sub-Nyquist additive random sampling
Posted on 2018-04-19 - 12:49
The round trip time of the light pulse limits the maximum detectable vibration frequency response range of phase-sensitive optical time domain reflectometry (φ-OTDR). Unlike the uniform laser pulse interval in conventional φ-OTDR, we randomly modulate the pulse interval, so that an equivalent sub-Nyquist additive random sampling (sNARS) is realized for every sensing point of the long interrogation fiber. For an φ-OTDR system with 10 km sensing length, the sNARS method is optimized by theoretical analysis and Monte Carlo simulation, and the experimental results verify that a wide-band spars signal can be identified and reconstructed. Such a method can broaden the vibration frequency response range of φ-OTDR, which is of great significance in sparse-wideband-frequency vibration signal detection, such as rail track monitoring and metal defect detection.
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Zhang, Jingdong; Zheng, Hua; Zhu, Tao; Yin, Guolu; Liu, Min; Bai, Yongzhong; et al. (2018). Distributed fiber sparse-wideband vibration sensing by sub-Nyquist additive random sampling. Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.4020547.v1
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AUTHORS (9)
JZ
Jingdong Zhang
HZ
Hua Zheng
TZ
Tao Zhu
GY
Guolu Yin
ML
Min Liu
YB
Yongzhong Bai
DQ
Dingrong Qu
FQ
FENG QIU
XH
Xianbin Huang