本文選題：分布式光纖傳感 + Brillouin散射�。� 參考：《燕山大學(xué)》2015年碩士論文

【摘要】：分布式光纖傳感技術(shù)可以在連續(xù)空間與時(shí)間上對(duì)光纖沿路路徑的被測(cè)量信息進(jìn)行實(shí)時(shí)監(jiān)測(cè),具有廣闊的發(fā)展前景。而基于Brillouin散射的分布式光纖傳感技術(shù)因其具有測(cè)量精度高、傳感距離長(zhǎng)以及實(shí)時(shí)性好等特點(diǎn),已成為光纖傳感領(lǐng)域的主流技術(shù)。本文針對(duì)Brillouin分布式光纖傳感系統(tǒng)在空間分辨率及測(cè)量精度方面存在的問(wèn)題展開(kāi)研究。具體如下:首先,本文簡(jiǎn)單闡述了光纖中散射的種類,論述了光纖中自發(fā)和受激Brillouin散射光的產(chǎn)生機(jī)理,研究了Brillouin散射譜參數(shù)與溫度和應(yīng)力變化之間的響應(yīng)特性及定量關(guān)系,分析了Brillouin散射信號(hào)檢測(cè)技術(shù)的分類及其特點(diǎn),并對(duì)布里淵光時(shí)域反射(BOTDR)系統(tǒng)的主要性能進(jìn)行了介紹。其次,針對(duì)多峰Brillouin散射譜中心頻移高精度及多特征的提取要求,本文提出了一種新的多峰Brillouin散射譜擬合算法,即MCDM-PSO-LM算法,該算法利用多準(zhǔn)則決策的原理與性質(zhì),準(zhǔn)確定位了多峰Brillouin散射譜各個(gè)波峰的位置,再對(duì)各個(gè)波峰分別進(jìn)行擬合,最終得到了多峰Brillouin散射譜的完整譜線,仿真分析表明該算法能夠有效提高系統(tǒng)的空間分辨率。再次,本文介紹了D-S證據(jù)理論的基本概念及其組合規(guī)則,在此基礎(chǔ)上提出了一種新的D-S證據(jù)理論組合規(guī)則,該規(guī)則可以對(duì)多峰Brillouin散射譜特征提取算法進(jìn)行驗(yàn)證與優(yōu)化,最終得到各個(gè)Brillouin散射譜波峰中心頻移的準(zhǔn)確值,提高了BOTDR系統(tǒng)的測(cè)量精度。最后,簡(jiǎn)單介紹了系統(tǒng)的整體結(jié)構(gòu),重點(diǎn)介紹了系統(tǒng)中的幾個(gè)重要模塊的參數(shù)及其在系統(tǒng)中的作用,得到了實(shí)驗(yàn)條件下的多峰Brillouin散射譜,并利用MCDM-PSO-LM算法對(duì)實(shí)驗(yàn)數(shù)據(jù)進(jìn)行擬合,得到了非常理想的結(jié)果。
[Abstract]:Distributed optical fiber sensing technology can real-time monitor the measured information along the path of optical fiber in continuous space and time, which has a broad development prospect. The distributed optical fiber sensing technology based on Brillouin scattering has become the mainstream technology in the field of optical fiber sensing because of its high measuring precision, long sensing distance and good real-time. In this paper, the spatial resolution and measurement accuracy of Brillouin distributed optical fiber sensor system are studied. The main contents are as follows: firstly, the types of scattering in optical fiber are briefly described, the mechanism of spontaneous and stimulated Brillouin scattering light in optical fiber is discussed, and the response characteristics and quantitative relationship between the parameters of Brillouin scattering spectrum and temperature and stress changes are studied. The classification and characteristics of Brillouin scattering signal detection technology are analyzed, and the main performance of Brillouin optical time domain reflectance (BOTDR) system is introduced. Secondly, a new multi-peak Brillouin scattering spectrum fitting algorithm, that is, MCDM-PSO-LM algorithm, is proposed, which utilizes the principle and properties of multi-criteria decision making, aiming at the high accuracy of center frequency shift of multi-peak Brillouin scattering spectrum and the requirement of extracting multi-feature. The location of each peak of the multi-peak Brillouin scattering spectrum is accurately located, and each peak is fitted separately. Finally, the complete spectral lines of the multi-peak Brillouin scattering spectrum are obtained. The simulation results show that the algorithm can effectively improve the spatial resolution of the system. Thirdly, this paper introduces the basic concept of D-S evidence theory and its combination rules. On this basis, a new D-S evidence theory combination rule is proposed, which can be used to verify and optimize the multi-peak Brillouin scattering spectrum feature extraction algorithm. Finally, the accurate values of the center frequency shift of each Brillouin scattering peak are obtained, and the measurement accuracy of the BOTDR system is improved. Finally, the whole structure of the system is briefly introduced, the parameters of several important modules in the system and their functions in the system are emphatically introduced, and the multi-peak Brillouin scattering spectra under experimental conditions are obtained, and the experimental data are fitted by using the MCDM-PSO-LM algorithm. Very ideal results have been obtained.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN253

【參考文獻(xiàn)】

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本文編號(hào)：1947172