基于光域移频的布里渊光时域反射技术试验平台搭建与关键技术研究
首发时间:2019-04-04
摘要:众所周知,光纤作为当今世界最主要的传输与传感介质,有着其不可取代的地位。光纤传感技术利用光纤可以同时作为传输与传感介质的特性而迅速发展起来,其中分布式光纤传感技术是当今世界热门研究课题之一。基于布里渊散射的分布式光纤传感技术可以同时实现对温度和应变的双参传感,本文对其进行大量的调研与深入的研究之后,提出了一种基于光域频移的布里渊光时域反射技术( Optical Domain Frequency Shift-Brillouin Optical Time Domain Reflection,ODFS-BOTDR)的设计方案。与传统的BOTDR相比,本文提出的ODFS-BOTDR利用光纤中受激布里渊散射信号特性,在光域实现对本地信号进行移频,并在本地信号路引入扰偏器,使其产生随机变化的偏振态,来消除由于偏振状态带来的不良影响,本方案不仅可以解决偏振敏感问题,还可以使系统结构简单,降低成本。最后根据设计方案搭建实验平台,调试 ODFS- BOTDR实验平台各器件,使其达到最佳工作状态,通过示波器采集自发布里渊散射信号,并对采集到信号进行数字信号处理,初步验证了实验思路的可行性,为后续对待测光纤进行温度和应变的双参传感研究奠定了坚实的基础。
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The establishment and key technology research of brillouin time-domain reflection technology test platform based on optical domain frequency shift
Abstract:As is known to all, optical fiber, as the most important transmission and sensing medium in the world, has an irreplaceable status.Optical fiber sensing technology can be developed rapidly by using optical fiber as both transmission and sensing medium. Distributed optical fiber sensing technology is one of the hot research topics in the world.Distributed Optical fiber sensing technology based on Brillouin scattering can realize dual parameter sensing of temperature and strain at the same Time. After a large number of investigations and in-depth studies, this paper proposes a design scheme of Optical Domain Frequency shift-brillouin Optical Time Domain Reflection (ODFS-BOTDR) based on Optical Domain Frequency Shift.Compared with the traditional BOTDR, this paper puts forward ODFS of BOTDR in the use of optical fiber stimulated brillouin scattering signal characteristics, and implemented in the light of local signal frequency shift, and in the local signal road into one unit, the polarization of the generated random changes, to eliminate the adverse effects caused by the polarization state, this scheme can not only solve the problem of polarization sensitive, also can make the system structure is simple, reduce the cost.According to the design of structures, experimental platform, the debugging ODFS - BOTDR experimental platform for each device, to the best working state, through the oscilloscope gathering since the deep scattering signal in the release, and the collected signal to digital signal processing, preliminary verify the feasibility of the philosophy, for the subsequent treatment of optical fiber measurement temperature and strain of double sensor research laid a solid foundation.
Keywords: Brillouin scattering BOTDR coherent detection of optical pulse modulation
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基于光域移频的布里渊光时域反射技术试验平台搭建与关键技术研究
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