【作者】 于涛；

【导师】 王玉田； 侯培国；

【作者基本信息】 燕山大学 ， 测试计量技术及仪器， 2006， 硕士

【摘要】 分布式光纤应变传感器是近年来开始研究的新型传感技术,由于它可以感知传输路径上应变、压力的空间分布和随时间变化的信息,分布式光纤传感器在多层建筑、桥梁、水坝、飞行器、压力容器等重大结构与设备方面有重要的应用前景。论文在前人关于非线性光学、布里渊光谱学以及分布式光纤应变传感器的研究基础上,围绕改进系统性能,建立了比较完整的分布式光纤应变传感系统设计的数学建模以及各项参数的计算,为合理的进行系统设计奠定了理论基础。论文研究内容主要包括以下几个方面:(1)首先论述了分布式光纤传感器的国内外研究状况和几种用于检测的基本方法。通过对多种可行的布里渊分布式光纤应变传感技术方案的比较、分析,立足于制造工艺、系统精度和国内外现有元器件,选择了基于受激布里渊散射的分布式光纤应变传感方案。(2)给出了受激布里渊散射光的定量描述,引入布里渊功率阈值的概念。经过定量分析,论证了布里渊散射光与光纤应变、温度呈良好的线性关系,并给出参数计算的过程,为正确应用分布式光纤应变传感系统提供了理论依据。(3)给出了分布式光纤应变传感系统的结构框图,并对传感系统的各个部分进行了讨论,选取了激光器工作波长,完成了两个激光器的驱动电路设计。(4)介绍系统设计过程中几个关键问题的解决,提出对于该系统的一种新的温度补偿方案。完成了部分传感系统实验,为系统的整体实现打下了坚实的基础。更多还原

【Abstract】 Distributed optical fiber strain sensor is a new sensing technique arisingrecently. It has important application foreground in heavy structure and devicesuch as multilayer architecture, bridge, dam, aerocraft, pressure vessel and soon, since it can apperceive spatial distribution of strain and pressure ontransmission path and information changed with time. Based on study ofnonlinear optics, Brillouin spectroscopy and distributed optical fiber strainsensor of predecessors, surrounding improvement of system performance, weestablished a relatively complete mathematic model building of distributedoptical fiber strain sensing system and performed calculation of each parameterto establish theoretical basis for reasonable system design.The primary studies are as follows:(1) Firstly we introduced study status and several basic methods ofdistributed optical fiber sensor both home and abroad. By comparison andanalysis of many feasible schemes for Brillouin distributed optical fiber strainsensing technique, and based on fabrication process, system precision andexisting components of home and abroad, we finally chose distributed opticalfiber strain sensing scheme which was based on stimulated Brillouin scattering.(2) Through introducing scattering light in optical fiber, we presentedquantitative description of stimulated Brillouin scattering light, and importedconcept of Brillouin power threshold. By quantificationally analyzing, wedemonstrated good linear relationship between Brillouin scattering light andstrain, temperature of optical fiber, and also presented process of parametercalculation, which provided theory for correctly using distributed optical fiberstrain sensing system.(3) We showed structure diagram for distributed optical fiber strainsensing system, discussed each part of the sensing system, selected workingwavelength of laser, and accomplished driving circuit’s design for two lasers.(4) Introducing solution of several key issues of system design, and puttingforward a new temperature compensation scheme for this system. Parts ofsensing system experiment are completed and firm basis for implementation ofwhole system are settled.更多还原