本文選題：準(zhǔn)分布式布拉格傳感網(wǎng)絡(luò) + 混沌激光　； 參考：《太原理工大學(xué)》2015年碩士論文

【摘要】：布拉格光纖光柵具有靈敏度高、質(zhì)量輕、體積小，制作簡單、抗電磁干擾、易于實(shí)現(xiàn)多路復(fù)用等優(yōu)點(diǎn),使得布拉格光纖光柵傳感器在大型復(fù)合材料、混凝土的結(jié)構(gòu)檢測、航空航天的安全檢測、石油天然氣儲層檢測、輸電線路的負(fù)載、溫度等檢測中得到了廣泛的應(yīng)用。本文提出了一種基于混沌光纖激光器的準(zhǔn)分布式布拉格光纖光柵傳感系統(tǒng)，將波長可調(diào)諧的混沌光纖激光器作為傳感光源，全同弱反射布拉格光纖光柵作為傳感元件實(shí)現(xiàn)光纖傳感。利用混沌光源具有delta函數(shù)的自相關(guān)特性，將混沌源的參考光信號與從全同弱反射布拉格光纖光柵反射的光信號經(jīng)光電探測器進(jìn)行光電轉(zhuǎn)換，結(jié)合相關(guān)法對參考光和反射光進(jìn)行相關(guān)運(yùn)算，根據(jù)相關(guān)峰的位置對傳感器位置進(jìn)行精確定位。利用混沌激光的可調(diào)諧性實(shí)現(xiàn)因應(yīng)力作用而發(fā)生變化的全同弱反射光纖光柵的中心波長的解調(diào)，從而實(shí)現(xiàn)準(zhǔn)分布式的傳感網(wǎng)絡(luò)。 圍繞這種傳感檢測技術(shù)，本文主要闡述了如下內(nèi)容： 1.查閱大量文獻(xiàn)，了解國內(nèi)外現(xiàn)存的準(zhǔn)分布式布拉格傳感檢測系統(tǒng)及光纖光柵傳感信息的解調(diào)技術(shù)，并總結(jié)其優(yōu)缺點(diǎn)。 2.理論分析了光纖光柵的分類、制作方法及傳感原理，為實(shí)驗(yàn)的順利進(jìn)行做好鋪墊。 3.實(shí)驗(yàn)實(shí)現(xiàn)了摻鉺光纖混沌激光器工作波長的連續(xù)可調(diào)諧，，并使之能與布拉格光纖光柵的中心波長相匹配，研究不同波長下混沌激光的輸出特性。實(shí)驗(yàn)結(jié)果表明：產(chǎn)生的波長可調(diào)諧的混沌激光可用于光纖光柵的應(yīng)力傳感解調(diào)并利用相關(guān)法準(zhǔn)確得到傳感元件的位置。 4.基于準(zhǔn)分布式的全同弱反射光纖光柵傳感陣列，實(shí)驗(yàn)完成對應(yīng)力的檢測和傳感定位。結(jié)果表明：波長可連續(xù)調(diào)諧的混沌激光可對布拉格光纖光柵進(jìn)行傳感解調(diào)，通過對反射光與信號光的相關(guān)曲線確定傳感器的位置。 5.對研究結(jié)果進(jìn)行分析總結(jié)和展望。
[Abstract]:Fiber Bragg grating (FBG) has the advantages of high sensitivity, light weight, small volume, simple fabrication, anti-electromagnetic interference, easy to realize multiplexing and so on. Aerospace safety detection, oil and gas reservoir detection, transmission line load, temperature detection have been widely used. In this paper, a quasi-distributed fiber Bragg grating sensing system based on chaotic fiber laser is proposed. The wavelength tunable chaotic fiber laser is used as the sensing source. Fiber optic sensing is realized by using fiber Bragg grating as sensing element. The chaotic light source has the autocorrelation property of the delta function. The reference light signal of the chaotic source and the optical signal reflected from the fully weakly reflected fiber Bragg grating are optoelectronic converted by the photodetector. The correlation method is used to calculate the correlation between the reference light and the reflected light, and the position of the sensor is accurately located according to the position of the correlation peak. The tunability of chaotic laser is used to demodulate the center wavelength of the fiber grating with the same weak reflection which changes due to the stress, thus the quasi-distributed sensing network is realized. Around this kind of sensor detection technology, this paper mainly elaborated the following contents: 1. By consulting a large number of literatures, the present quasi-distributed Bragg sensing detection system and the demodulation technology of fiber Bragg grating sensing information are discussed, and their advantages and disadvantages are summarized. 2. The classification, fabrication method and sensing principle of fiber grating are analyzed theoretically. 3. The continuously tunable operating wavelength of erbium-doped fiber chaotic laser is experimentally realized, and it can match the central wavelength of Bragg fiber grating. The output characteristics of chaotic laser at different wavelengths are studied. The experimental results show that the generated wavelength tunable chaotic laser can be used to demodulate the fiber Bragg grating (FBG) stress sensor and the position of the sensor element can be accurately obtained by using the correlation method. 4. Based on the quasi-distributed fiber Bragg grating sensor array with the same weak reflection, the stress detection and sensing location are performed experimentally. The results show that the fiber Bragg grating can be demodulated by chaotic laser with continuously tunable wavelength, and the position of the sensor can be determined by the correlation curve between reflected light and signal light. 5. The research results are analyzed and summarized.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN253

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