本文選題：布里淵光時(shí)域分析 + 脈沖預(yù)泵浦�。� 參考：《華北電力大學(xué)》2015年碩士論文

【摘要】：本文綜述了布里淵分布式光纖傳感技術(shù)的研究現(xiàn)狀,論述了光纖中的布里淵散射及其特征參數(shù),研究了布里淵頻移與光纖溫度和應(yīng)變的對(duì)應(yīng)關(guān)系,根據(jù)布里淵光時(shí)域分析(BOTDA)系統(tǒng)中布里淵頻移的溫度和應(yīng)變交叉敏感特性,總結(jié)了三種同時(shí)實(shí)現(xiàn)溫度和應(yīng)變測(cè)量的方法。根據(jù)受激布里淵散射(SBS)的作用機(jī)理,分析了其穩(wěn)態(tài)耦合波方程和瞬態(tài)耦合波方程。介紹了偏振光相關(guān)基本理論,在理論分析電光調(diào)制器(EOM)的內(nèi)部結(jié)構(gòu)、輸入輸出關(guān)系數(shù)學(xué)表達(dá)式及其偏振相關(guān)特性的基礎(chǔ)上,設(shè)計(jì)了BOTDA中EOM輸入光的偏振控制系統(tǒng)。推導(dǎo)了擠壓光纖型偏振控制器光偏振態(tài)的輸入輸出關(guān)系數(shù)學(xué)表達(dá)式,建立了EOM輸入光自適應(yīng)偏振控制系統(tǒng)數(shù)學(xué)模型;理論分析了PID工業(yè)控制算法并首次提出將其應(yīng)用于偏振控制系統(tǒng)中,并選擇了其參數(shù)整定方法,設(shè)計(jì)并編寫了PID偏振控制算法程序,搭建了基于LabVIEW的偏振控制系統(tǒng)軟件平臺(tái);搭建了基于數(shù)據(jù)采集與控制的偏振控制系統(tǒng)硬件平臺(tái)。理論分析并實(shí)驗(yàn)驗(yàn)證了該方法的可行性。實(shí)驗(yàn)結(jié)果表明,基于該方法設(shè)計(jì)的控制系統(tǒng)不僅能實(shí)時(shí)監(jiān)測(cè)EOM輸出光功率,而且能保持其輸出光功率最大;與激光器和EOM輸入端直接用保偏光纖連接時(shí)相比,PID偏振控制下EOM輸出平均功率提高了3.08 dB,PD輸出電壓標(biāo)準(zhǔn)差由0.1214降至1.2375×10-4,穩(wěn)定控制狀態(tài)下偏振態(tài)矯正時(shí)間在ms量級(jí),滿足BOTDA的偏振控制系統(tǒng)要求。分析了脈沖預(yù)泵浦BOTDA傳感系統(tǒng)原理,利用差分增益法對(duì)脈沖預(yù)泵浦BOTDA的瞬態(tài)耦合波方程進(jìn)行解析,并對(duì)傳感系統(tǒng)進(jìn)行了設(shè)計(jì)。
[Abstract]:In this paper, the research status of Brillouin distributed fiber sensing technology is reviewed, the Brillouin scattering and its characteristic parameters are discussed, and the relationship between Brillouin frequency shift and fiber temperature and strain is studied. According to the characteristics of temperature and strain cross sensitivity of Brillouin frequency shift in BOTDA system, three methods for simultaneous measurement of temperature and strain are summarized. According to the mechanism of stimulated Brillouin scattering (SBS), the steady-state coupled wave equation and transient coupled wave equation are analyzed. The basic theory of polarized light correlation is introduced. Based on the theoretical analysis of the internal structure of the electro-optic modulator EOM, the mathematical expression of the input and output relations and the polarization correlation characteristics, the polarization control system of the EOM input light in BOTDA is designed. The mathematical expression of the input and output relationship of the polarization state of the squeezed fiber polarization controller is derived, and the mathematical model of the adaptive polarization control system of the EOM input light is established. The PID industrial control algorithm is analyzed theoretically and applied to the polarization control system for the first time. The parameter setting method is selected, the PID polarization control algorithm program is designed and written, and the software platform of the polarization control system based on LabVIEW is built. The hardware platform of polarization control system based on data acquisition and control is built. The feasibility of the method is verified by theoretical analysis and experiments. The experimental results show that the control system based on this method can not only monitor the output optical power of EOM in real time, but also maintain the maximum output optical power. Compared with that when the laser and EOM input are connected directly by polarization maintaining fiber, the average output power of EOM under pid polarization control is increased from 0.1214 to 1.2375 脳 10 ~ (-4), and the correction time of polarization state is in the order of Ms under stable control condition, and the output voltage standard deviation of EOM is decreased from 0.1214 to 1.2375 脳 10 ~ (-4). Meet the requirements of BOTDA polarization control system. The principle of pulse prepumped BOTDA sensing system is analyzed, and the transient coupled wave equation of pulse prepumped BOTDA is analyzed by differential gain method, and the sensing system is designed.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN253

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