Single-end hybrid Rayleigh Brillouin and Raman distributed fibre-optic sensing system  

作　　者：Linjing Huang Xinyu Fan Haijun He Lianshan Yan Zuyuan He 

机构地区：[1]State Key Laboratory of Advanced Optical Communication Systems and Networks,Department of Electronic Engineering,Shanghai Jiao Tong University,800 Dongchuan Road,Shanghai 200240,China [2]Center for Information Photonics&Communications,School of Information Science and Technology,Southwest Jiaotong University,Chengdu,Sichuan 611756,China [3]Peng Cheng Laboratory,Shenzhen,Guangdong 518055,China

出　　处：《Light(Advanced Manufacturing)》2023年第3期171-180,共10页光（先进制造）（英文）

基　　金：funding from the National Natural Science Foundation of China(NSFC)under grant numbers 61735015,62275151;the Major Key Project of PCL.

摘　　要：Backscattered lightwaves from an optical fibre are used to realise distributed fibre optic sensing(DFOS)systems for measuring various parameters.Rayleigh,Brillouin,and Raman backscattering provide different sensitivities to different measurands and have garnered the attention of researchers.A system combining the three principles above can effectively separate the measured strain and temperature completely as well as provide measurements of both dynamic and static parameters.However,the combined system is extremely complicated if the three systems are independent of each other.Hence,we propose a single-end hybrid DFOS system that uses two successive pulses to realise the Brillouin amplification of Rayleigh backscattering lightwaves for combining Rayleigh and Brillouin systems.A 3-bit pulse-coding method is employed to demodulate the Raman scattering of the two pulses to integrate Raman optical time-domain reflectometry into the hybrid system.Using this hybrid scheme,a simultaneous measurement of multiple parameters is realised,and a favourable measurement accuracy is achieved.

关 键 词：Rayleigh backscattering Brillouin backscattering Raman backscattering Distributed fiber-optic sensing system 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]