【作者】 史彦新；

【导师】 魏文博；

【作者基本信息】 中国地质大学（北京） ， 地球探测与信息技术， 2010， 博士

【摘要】 分布式光纤传感器具有传输距离长、抗电磁干扰能力强,能够较全面地获取监测目标体参数信息的特点,可实现长期在线分布式监测,适合长期实时监测大型结构体的变化。基于分布式光纤传感器的优点及国家对地质灾害监测技术发展的重视,论文在“十一五”国家科技支撑计划课题(2006BAC04B03)及中国地质调查局地质调查工作项目(1212010641008)的支持下开展布里渊分布式光纤应变监测技术的研究及仪器的研发。在光纤中传播的光会产生布里渊散射现象,布里渊散射光的频移与光纤所处温度环境和所受应变有关。论文通过对布里渊散射机理的介绍,说明了布里渊散射频移与应变和温度之间的关系,阐述了分布式光纤应变监测系统研制的理论基础。利用微波电光调制光相干检测技术,采用模块化设计,研制了分布式光纤应变监测系统样机。论文通过对背向布里渊散射光各种检测方案的对比,提出了分布式光纤应变监测系统的设计思路,确定了分布式光纤应变监测系统的结构框架,在此基础上,对监测系统参数、监测系统各模块的硬件与软件设计和实现方法进行了深入研究,研制了分布式光纤应变监测系统样机。通过标定试验和室内模拟试验,验证了样机的性能。监测光纤应变量受温度影响的校正试验中,运用线性回归等统计分析方法,获得了光纤应变受环境温度影响的函数关系,为实际工程的BOTDR应变监测数据处理提供了理论依据。在三峡库区巫山县邓家屋场滑坡进行了分布式光纤应变监测试验,探索了光纤选型、网络布设、铺设方法等施工工艺。提出了FBG与BOTDR联合监测滑坡的方案,并在巫山残联滑坡进行了监测试验,进一步探讨了分布式光纤与光纤光栅联合监测的可行性及优点。更多还原

【Abstract】 Distributed fiber optic sensor can meet the requirements of long-distance and continuous monitoring, be easy to achieve the remote sensing and controlling, obtain the parameter information of monitoring body completely. It is suitable to monitor the variety of large structure body. Based on the advantage and funded by the project "Eleventh Five-Year" National Key Technology R&D Program (2006BAC04B03) and the Geological Survey Project of CGS (1212010641008), the dissertation studied on the Brillouin distributed fiber optic sensing technique and developed the fiber optic strain monitoring system.In general, Brillouin scattering would occur when light transmitted in the fiber. The Brillouin frequency shift will change when the fiber materials are affected by the temperature or strain. The dissertation introduced the theory of the Brillouin scattering, and illustrated the relations between the Brillouin frequency shift and strain and temperature.According to the principle of BOTDR, we used the optical coherent detection method between the backward Brilliouin scattering light and the local reference light which generated by the microwave electro-optic modulator to develop the BOTDR monitoring system. The dissertation contrasted various detection schemes of the backward Brilliouin scattering light, identified the design of the distributed fiber optic strain monitoring system. Based on that, the author studied on the calculation of parameters of the monitoring system and the design and achievement of the hardware and software intensively, developed the BOTDR monitoring system.Through the calibration and simulation test in the lab, the performance of monitoring system was verified. In the correct experiment of fiber strain monitoring influenced by temperature, used statistics analysis method to acquire the function relation of the fiber strain measuring influenced by the environment temperature, provided theory guide for the data processing of the actual BOTDR monitoring project.In Deng Jia Wu Chang landslide in Wushan in Chongqing, The distributed fiber optic strain field monitoring experiment was carried on. The approach to monitoring landslide, such as the fiber type choosing, the fiber embedment craft, the fiber network arrangement principle and so on, was explored and practiced. Put forward the approach to monitoring landslide with FBG and BOTDR and practiced in Canlian landslide in Wushan, further discussed the possibility and advantage of BOTDR combining with FBG to monitor landslide.更多还原