Self-copy-shift-based differential phase extracting method for fiber distributed acoustic sensing

被引：6
|
作者：
Chen, Wenjie [1 ,2 ,3 ,4 ]
Jiang, Junfeng [1 ,2 ,3 ]
Liu, Kun [1 ,2 ,3 ]
Wang, Shuang [1 ,2 ,3 ]
Ma, Zhe [1 ,2 ,3 ]
Liang, Guanhua [1 ,2 ,3 ]
Ding, Zhenyang [1 ,2 ,3 ]
Xu, Tianhua [1 ,2 ,3 ]
Liu, Tiegen [1 ,2 ,3 ]
机构：
[1] Tianjin Univ, Sch Precis Instrument & Optoelect Engn, Tianjin 300072, Peoples R China
[2] Tianjin Univ, Minist Educ, Key Lab Optoelect Informat Technol, Tianjin 300072, Peoples R China
[3] Tianjin Univ, Inst Opt Fiber Sensing, Tianjin Opt Fiber Sensing Engn Ctr, Tianjin 300072, Peoples R China
[4] Sci & Technol Commun Networks Lab, Shijiazhuang 050002, Hebei, Peoples R China
来源：
CHINESE OPTICS LETTERS | 2020年 / 18卷 / 08期
基金：
中国国家自然科学基金;
关键词：
optical fiber sensing; phase extraction; coherent OTDR; distributed sensing; SENSOR; REFLECTOMETER; FREQUENCY; MODULATOR;
D O I：
10.3788/COL202018.081201
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A differential phase extracting method based on self-copy-shift for distributed acoustic sensing is proposed. Heterodyne and optical hybrids are used to realize high signal-to-noise ratio in-phase and quadrature-phase (IQ) signal measurement. The measured signals are self-copied and shifted for certain data points, and then they are digitally mixed with the original signals to construct the differential phase. The four produced signals are then combined to carry out IQ demodulation. An experiment with strain having an amplitude modulation waveform is carried out. The results showed that waveform information can be recovered well, and the signal-to-noise ratio achieves 32.8 dB.
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收藏
页数：5
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