【作者】 耿军平；

【导师】 许家栋；

【作者基本信息】 西北工业大学 ， 电路与系统， 2002， 博士

【摘要】 光纤传感器取代传统的传感器已是大势所趋，全分布式光纤传感器更是由于它测试范围大、精度高而赢得人们的青睐。本文以分布式温度和光纤微弯损耗为对象以光频域Rayleigh散射和Raman散射为基础研究了全分布式光纤传感器的测试平衡条件、模型和算法。 本文从理论分析和数据仿真两个方面研究了全分布式光纤传感器系统，主要内容安排如下： 第一章，介绍了本文的研究背景和全分布式光纤传感器的当前进展，指出了基于光频域散射的全分布式光纤传感器的优点。 第二章，分析了自发Raman散射理论模型和单个分子的自发Raman散射的功率。 第三章，研究了自发Raman散射中光子所遵从的Bose-Einstein分布及其平衡条件，给出了光纤中两种光子布居概率ρ_S、ρ_AS和温度T看作位置z的函数的关系。 第四章，研究了基于自发Raman散射的多模阶跃光纤的全分布式温度传感器系统。 第五章，分别用两种不同的算法研究了基于自发Raman散射的多模梯度光纤的全分布式温度传感器系统。 第六章，研究了基于自发Raman散射的单模阶跃光纤的全分布式温度传感器系统。 第七章，研究了Rayleigh光频域背向散射理论模型，和基于该模型的全分布式光纤微弯损耗传感器系统。 第八章，研究了基于Rayleigh光频域背向散射和Raman光频域背向散射理论同时测量微弯和温度分布的全分布式光纤传感器系统。更多还原

【Abstract】 Optical fibers recently have become more important elements in communication and sensor systems due to their high efficiency of transport and large bandwidth. These properties have made optical fiber sensor increasingly more important than the traditional sensors. Especially, people pay more attention to the fully distributed optical fiber sensor for it’s large scale, high resolution and less error.In this dissertation, the thermodynamics equilibrium condition, modal and arithmetic to the fully distributed optical fiber sensor on base of Raman and Rayleigh optical back scattering reflectometry are studied.The fully distributed optical fiber sensor system is studied by theory and emulational methods. The contents are organized as follows:Chapter 1. an over view of the research background is introduced, and the advantages of the fully distributed optical fiber sensor on base of the OFDR (optical frequency domain backscattering reflectometry) are presented.Chapter 2. spontaneous Raman scattering and the Raman scattering power of one molecule are analyzed.Chapter 3. the Bose-Einstein distribution and the thermodynamics equilibrium condition which are obeyed by the photons during spontaneous Raman scattering in the fiber are developed. The occupation probability ( s, AS) of stokes photon and anti-stokes photons and temperature (T) can be regarded as the function of the position along the fiber axis.Chapter 4. the fully distributed temperature multimode step-index fiber optic sensor based on spontaneous Raman optical frequency-domain reflectometry is developed.Chapter 5, the fully distributed temperature multimode graded-index fiber optic sensor based on spontaneous Raman optical frequency-domain reflectometry is further developed by two methods.Chapter 6, the fully distributed temperature single mode step-index fiber optic sensor based on spontaneous Raman optical frequency-domain reflectometry is developed.Chapter 7. the theoretical model of Rayleigh optical frequency domain reflectometry is presented, and the fully distributed microbending loss optical fiber sensor on base of this model is studied.Chapter 8. the fully distributed optical fiber sensor system on base of Raman and Rayleigh optical frequency-domain reflectometry to measure microbend and temperature simultaneously is developed.更多还原