传感技术学报2025，Vol.38Issue(12)：2121-2129,9.DOI:10.3969/j.issn.1004-1699.2025.12.002
编码ROTDR辅助的BOTDR光纤传感系统研究
Research on BOTDR Optical Fiber Sensing System Assisted by Coded ROTDR
摘要
Abstract
Raman optical time domain reflectometer(ROTDR)combined with Brillouin optical time domain reflectometer(BOTDR),is one of the important means to solve the cross sensitivity between temperature and strain in BOTDR.However,the application of ROTDR in single mode fiber still has the problems of short measurement distance and low signal-to-noise ratio,and it cannot be used with BOT-DR in engineering applications over long distances.A BOTDR fiber sensing system based on applying Golay codes on ROTDR is pro-posed.Four sets of 32-bit Golay encoding are used to detect and improve the SNR of single mode fiber in ROTDR temperature measure-ment.Meanwhile,Brillouin frequency transfer demodulation is combined to realize dual parameter sensing.The experimental show that for the system using single-mode optical fiber,the 32-bit Golay pulse-coded ROTDR increases the effective sensing distance from about 13.46 km to 25.60 km compared with the single pulse detection with the same peak power under 3 m spatial resolution.The temperature and strain fluctuation range of the two-parameter sensor system on the 25.60 km optical fiber are±1.5℃and±32.5 με,respectively.The results show that the scheme can realize the decoupling measurement of temperature and strain in long distance,which provides a solution for practical engineering applications.关键词
光纤传感/Golay编码/拉曼散射/布里渊散射Key words
optical fiber sensing/Golay pulse coding/Raman scattering/Brillouin scattering分类
信息技术与安全科学引用本文复制引用
曲晓辉,白清,于博闻,武北松,王宇,靳宝全..编码ROTDR辅助的BOTDR光纤传感系统研究[J].传感技术学报,2025,38(12):2121-2129,9.基金项目
山西省重点研发计划项目(202202130501004) （202202130501004）
中央引导地方科技发展资金项目(YDZJSX20231B004) （YDZJSX20231B004）
山西省科技创新团队项目(201805D131003) （201805D131003）
