Digital phase shift based simulated coherence phase demodulation technology for Φ-OTDR
In this paper, we propose a digital phase demodulation scheme for phase-sensitive optical time-domain reflectometer (Φ-OTDR) systems based on simulated coherence for digital phase shift, in which three-path signals with a phase interval of 120° can be obtained by employing digital simulated orthogonal coherence for phase shift instead of using a hardware 3×3 coupler and three detectors, while the high-frequency component can be eliminated through cross differential between simulated coherence signals. On this basis, the phase variation of Rayleigh backscattering (RBS) light can be analyzed by differential cross multiplication (DCM). The performance of the proposed scheme is evaluated through experiments by detecting a series of vibration signals with various sensing distances, vibration frequencies, and waveforms. The experimental results demonstrate that the phase variation caused by external vibration can be effectively reconstructed and a strain resolution of 0.5 nɛ and the SNR of 51.03 dB can be achieved through the proposed demodulation method, which significantly simplifies the system and effectively suppresses the deviation of phase interval and noise caused by hardware demodulation.
Natural Science Basic Re-search Program of Shaanxi, China[2021JZ-45] ; Major Project of Inner Mongolia Science and Technology, China[2021ZD0034]
|WOS Research Area|
|WOS Accession No|
|ESI Research Field|
Cited Times [WOS]:0
|Document Type||Journal Article|
|Department||School of Innovation and Entrepreneurship|
1.School of Physics,Northwest University,Xi'an,710069,China
2.State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,430071,China
3.School of Innovation and Entrepreneurship,Southern University of Science and Technology,Shenzhen,518055,China
4.International Institute of Urban Systems Engineering,Southeast University,Nanjing,210018,China
Fan，Ting,Li，Qi,Shao，Liyang,et al. Digital phase shift based simulated coherence phase demodulation technology for Φ-OTDR[J]. Optics Communications,2023,546.
Fan，Ting,Li，Qi,Shao，Liyang,Wu，Zhishen,&Sun，An.(2023).Digital phase shift based simulated coherence phase demodulation technology for Φ-OTDR.Optics Communications,546.
Fan，Ting,et al."Digital phase shift based simulated coherence phase demodulation technology for Φ-OTDR".Optics Communications 546(2023).
|Files in This Item:||There are no files associated with this item.|
|Recommend this item|
|Export to Endnote|
|Export to Excel|
|Export to Csv|
|Similar articles in Google Scholar|
|Similar articles in Baidu Scholar|
|Similar articles in Bing Scholar|
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.