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-tonoise ratio achieves 32.8 dB.
作者
Wenjie Chen
Junfeng Jiang
Kun Liu
Shuang Wang
Zhe Ma
Guanhua Liang
Zhenyang Ding
Tianhua Xu
Tiegen Liu
陈文杰;江俊峰;刘琨;王双;马喆;梁冠华;丁振扬;徐天华;刘铁根(School of Precision Instrument and Opto-electronics Engineering,Tianjin University,Tianjin 300072,China;Key Laboratory of Opto-electronics Information Technology(Tianjin University),Ministry of Education,Tianjin 300072,China;Tianjin Optical Fiber Sensing Engineering Center,Institute of Optical Fiber Sensing of Tianjin University,Tianjin 300072,China;Science and Technology on Communication Networks Laboratory,Shijiazhuang 050002,China)
基金
supported in part by the National Natural Science Foundation of China(Nos.61675152 and61735011)
the National Instrumentation Program of China(No.2013YQ030915)
the Tianjin Talent Development Special Plan for High Level Innovation and Entrepreneurship Team
the Open Project of Key Laboratory of Opto-electronics Information Technology(No.2019KFKT007)。
