發(fā)布時(shí)間：2018-12-09 19:17

【摘要】：分布式光纖傳感技術(shù)是近些年來發(fā)展比較迅速、應(yīng)用較為廣泛的一項(xiàng)傳感技術(shù),由于其成本較低,具有良好的隱蔽性,更有靈敏度高、耐高溫、耐腐蝕和抗電磁干擾能力強(qiáng)等優(yōu)越特性,其在邊境安全、社區(qū)安全、長距離管道監(jiān)測、地震監(jiān)測以及建筑結(jié)構(gòu)監(jiān)測等領(lǐng)域具有廣闊的使用前景。目前對(duì)分布式光纖傳感技術(shù)的研究重點(diǎn)主要是光纖傳感結(jié)構(gòu)的改進(jìn),而對(duì)其信號(hào)的處理尤其是特征參數(shù)的提取則研究較少。而衡量一個(gè)分布式光纖傳感系統(tǒng)的性能優(yōu)劣不僅要看其是否能夠感知外部擾動(dòng),更要看其是否能夠精確識(shí)別該擾動(dòng)為外部環(huán)境擾動(dòng)還是入侵行為。為了能夠更好的識(shí)別分析入侵振動(dòng)信號(hào),通過研究分析分布式光纖傳感結(jié)構(gòu)和振動(dòng)信號(hào)識(shí)別的相關(guān)技術(shù),根據(jù)振動(dòng)信號(hào)的特點(diǎn),借鑒語音信號(hào)的處理方法,將其處理方法引入到對(duì)光纖振動(dòng)信號(hào)的處理分析上來。本論文在介紹分布式光纖傳感基本原理的基礎(chǔ)上,重點(diǎn)介紹了目前應(yīng)用比較多的幾類光纖傳感結(jié)構(gòu),在對(duì)比分析其優(yōu)缺點(diǎn)后選取馬赫-增德爾光纖傳感結(jié)構(gòu)為本論文的光纖傳感結(jié)構(gòu);然后分別從時(shí)域、頻域和語音信號(hào)識(shí)別算法上介紹了幾類常用的信號(hào)處理算法,分析各算法優(yōu)劣,最終從頻域和語音信號(hào)識(shí)別算法中各選取一種算法進(jìn)行對(duì)比分析。接著介紹了本論文所設(shè)計(jì)的系統(tǒng)架構(gòu),重點(diǎn)是上位機(jī)系統(tǒng),主要包括前端交互界面、數(shù)據(jù)存儲(chǔ)以及算法處理分析模塊;最后通過實(shí)驗(yàn)采集下雨和入侵兩類信號(hào),分別用兩種不同的算法對(duì)其進(jìn)行處理分析,結(jié)果證明基于語音信號(hào)處理的算法不僅可以應(yīng)用到光纖振動(dòng)信號(hào)的分析上來,而且其識(shí)別精度更高。
[Abstract]:Distributed optical fiber sensing technology is a kind of sensing technology which has been developed rapidly and widely used in recent years, because of its low cost, good concealment, high sensitivity and high temperature resistance. Because of its excellent characteristics such as corrosion resistance and strong resistance to electromagnetic interference, it has broad application prospects in the fields of border security, community safety, long-distance pipeline monitoring, seismic monitoring and building structure monitoring and so on. At present, the research focus of distributed optical fiber sensing technology is the improvement of optical fiber sensing structure, but the signal processing, especially the extraction of characteristic parameters, is less studied. The performance of a distributed optical fiber sensing system depends not only on whether it can perceive the external disturbance, but also on whether it can accurately identify the disturbance as an external disturbance or an intrusion behavior. In order to identify and analyze the intrusion vibration signal better, through the research and analysis of the distributed optical fiber sensor structure and vibration signal recognition technology, according to the characteristics of the vibration signal, the speech signal processing method is used for reference. Its processing method is introduced to the analysis of the optical fiber vibration signal processing. On the basis of introducing the basic principle of distributed optical fiber sensing, this paper focuses on several kinds of optical fiber sensing structures, which are widely used at present. After comparing and analyzing its merits and demerits, we choose Mah-Zendel optical fiber sensing structure as the optical fiber sensing structure in this paper. Then, several kinds of common signal processing algorithms are introduced from time domain, frequency domain and speech signal recognition algorithms, and the advantages and disadvantages of each algorithm are analyzed. Finally, one algorithm is selected from frequency domain and speech signal recognition algorithm to compare and analyze. Then the paper introduces the architecture of the system, which focuses on the host computer system, including the front-end interface, data storage and algorithm processing and analysis module; Finally, two kinds of signals, rain and intrusion, are collected and analyzed by two different algorithms. The results show that the algorithm based on speech signal processing can not only be applied to the analysis of optical fiber vibration signal. And its recognition accuracy is higher.
【學(xué)位授予單位】：華中科技大學(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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本文編號(hào)：2369897