Long-range distributed vibration sensing based on internal-modulation OFDR  

作　　者：Yaoli Yue Jing Zeng Zhenyang Ding Teng Zhang Haohan Guo Tiegen Liu 

机构地区：[1]34th Research Institute of China Electronics Technology Group Corporation(CETC),Guilin 541004,China [2]School of Precision Instruments and Opto-electronics Engineering,Tianjin University,Tianjin 300072,China [3]Key Laboratory of Opto-electronics Information Technology(Tianjin University),Ministry of Education,Tianjin 300072,China [4]Tianjin Optical Fiber Sensing Engineering Center,Tianjin 300072,China

出　　处：《Nanotechnology and Precision Engineering》2024年第4期8-15,共8页纳米技术与精密工程(英文)

基　　金：supported by the 34th Research Institute of CETC Funding(Grant No.K134002021S604);the New Technology Research University Cooperation Project of the 34th Research Institute of CETC(Grant No.2021-1200-05-001900).

摘　　要：Presented here is long-range distributed vibration sensing based on internal-modulation optical frequency domain reflectometry(OFDR).In the proposed system with internal modulation,a silicon-based photonic-chip laser is used as the laser source,and by controlling the output voltage curve of an arbitrary waveform generator to induce temperature change in the external cavity of the laser,a 10-GHz optical frequency tuning range is achieved.The complexity of the proposed internal-modulation system is lower than that of the traditional external-modulation OFDR system that combines a narrow-linewidth laser with a single-sideband modulator to achieve wavelength tuning.Cross-correlation analysis is used as a sensing mechanism to evaluate the similarity between Rayleigh scatter signals and to achieve vibration event localization.Experimental comparison is made of the vibration sensing performance of the external-and internal-modulation systems,and for a vibration event generated at a distance of 100.95 km,they locate it with a sensing spatial resolution of 43.0 m and 16.8 m,respectively.The results indicates that the proposed distributed vibration sensing based on internal modulation has better sensing performance and lower complexity compared to the traditional external-modulation system.In addition,the proposed system is single-ended and involves no optical amplification,which makes it very suitable for ultra-long-range sensing.

关 键 词：Distributed optical fiber sensing Distributed vibration sensing Optical frequency domain reflectometry Internal modulation 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]