Chinese Optics Letters, 2020, 18 (8): 081201, Published Online: Jul. 10, 2020
Self-copy-shift-based differential phase extracting method for fiber distributed acoustic sensing 
Download： 921次
Abstract
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.
Wenjie Chen, Junfeng Jiang, Kun Liu, Shuang Wang, Zhe Ma, Guanhua Liang, Zhenyang Ding, Tianhua Xu, Tiegen Liu. Self-copy-shift-based differential phase extracting method for fiber distributed acoustic sensing[J]. Chinese Optics Letters, 2020, 18(8): 081201.
PDF全文
