基于LabVIEW的布里渊光纤传感信号解调技术
发布时间：2019-04-27 22:34
【摘要】：基于LabVIEW的光纤传感信号解调技术可以快速的检测出由于温度和应变的变化而引起的布里渊散射信号强度和频移，在实际工程应用中潜力巨大。布里渊散射的分布式光纤传感技术可以用来检测石油、天然气管道的泄露，桥梁、隧道等大型混凝土结构的温度和应力，，通过温度和应变的变化，随时准确全面的了解被测目标的各种情况，预防火灾和坍塌等事故的发生，以保障人们生命财产安全。针对这些问题，本文提出的基于LabVIEW的光纤传感信号解调主要是为了解决布里渊散射信号弱，且传统技术相对复杂，解调速度慢，成本高的问题，为研制快速解调的布里渊传感器奠定基础。 论文的主要研究内容包括： （1）介绍了本文的研究背景，着重介绍了布里渊光时域反射技术的国内外研究进展及两种主要的布里渊散射频率解调方法，分析了光纤中的布里渊散射理论和传感原理，为理解布里渊分布式传感系统信号的产生奠定理论基础。 （2）研究了BOTDR系统结构设计及基于LabVIEW的相应软件系统设计。建立了BOTDR相干检测系统，对软件系统的功能模块化，并对采集数据的分析与管理做了详细的阐述。 （3）设计基于LabVIEW的软件系统功能模块。研究并设计了数据采集模块、数据处理模块、数据存储模块，并详细阐述了各个功能模块的功能。 （4）对BOTDR数据采集系统功能测试及其数据分析，并对26Km传感光纤的频率解调结果分析，对系统中存在的主要问题进行了说明。
[Abstract]:The optical fiber sensing signal demodulation technology based on LabVIEW can quickly detect the Brillouin scattering signal intensity and frequency shift caused by the change of temperature and strain, which has great potential in practical engineering applications. Brillouin scattering distributed optical fiber sensing technology can be used to detect the leakage of oil and natural gas pipelines, bridges, tunnels and other large concrete structures, temperature and stress, through the temperature and strain changes, In order to ensure the safety of people's life and property, we can understand exactly and comprehensively all kinds of situations of the tested target, prevent fire and collapse and so on. In order to solve these problems, the optical fiber sensing signal demodulation based on LabVIEW is mainly to solve the Brillouin scattering signal weak, and the traditional technology is relatively complex, the demodulation speed is slow, and the cost is high. It lays a foundation for the development of Brillouin sensor with fast demodulation. The main contents of this thesis are as follows: (1) the research background of this paper is introduced, and the research progress of Brillouin optical time domain reflectometry and two main methods of Brillouin scattering frequency demodulation are emphatically introduced. The Brillouin scattering theory and sensing principle in optical fiber are analyzed, which lays a theoretical foundation for understanding the signal generation of Brillouin distributed sensing system. (2) the structure design of BOTDR system and the corresponding software system design based on LabVIEW are studied. The BOTDR coherent detection system is established, the function of the software system is modularized, and the analysis and management of the collected data are described in detail. (3) Design the function module of software system based on LabVIEW. The data acquisition module, data processing module and data storage module are studied and designed, and the functions of each function module are described in detail. (4) the function test and data analysis of BOTDR data acquisition system, and the frequency demodulation results of 26Km sensing fiber are analyzed, and the main problems in the system are explained.
【学位授予单位】：中国计量学院
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN253;TN911.3
本文编号：2467366
[Abstract]:The optical fiber sensing signal demodulation technology based on LabVIEW can quickly detect the Brillouin scattering signal intensity and frequency shift caused by the change of temperature and strain, which has great potential in practical engineering applications. Brillouin scattering distributed optical fiber sensing technology can be used to detect the leakage of oil and natural gas pipelines, bridges, tunnels and other large concrete structures, temperature and stress, through the temperature and strain changes, In order to ensure the safety of people's life and property, we can understand exactly and comprehensively all kinds of situations of the tested target, prevent fire and collapse and so on. In order to solve these problems, the optical fiber sensing signal demodulation based on LabVIEW is mainly to solve the Brillouin scattering signal weak, and the traditional technology is relatively complex, the demodulation speed is slow, and the cost is high. It lays a foundation for the development of Brillouin sensor with fast demodulation. The main contents of this thesis are as follows: (1) the research background of this paper is introduced, and the research progress of Brillouin optical time domain reflectometry and two main methods of Brillouin scattering frequency demodulation are emphatically introduced. The Brillouin scattering theory and sensing principle in optical fiber are analyzed, which lays a theoretical foundation for understanding the signal generation of Brillouin distributed sensing system. (2) the structure design of BOTDR system and the corresponding software system design based on LabVIEW are studied. The BOTDR coherent detection system is established, the function of the software system is modularized, and the analysis and management of the collected data are described in detail. (3) Design the function module of software system based on LabVIEW. The data acquisition module, data processing module and data storage module are studied and designed, and the functions of each function module are described in detail. (4) the function test and data analysis of BOTDR data acquisition system, and the frequency demodulation results of 26Km sensing fiber are analyzed, and the main problems in the system are explained.
【学位授予单位】：中国计量学院
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN253;TN911.3
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