發(fā)布時(shí)間：2018-01-07 04:25

  本文關(guān)鍵詞：可調(diào)諧DFB激光器動(dòng)態(tài)掃描的FBG解調(diào)系統(tǒng)研究　出處：《哈爾濱理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 光纖布拉格光柵 解調(diào) 尋峰算法 傳感技術(shù)

【摘要】：光纖布拉格光柵（FBG）傳感器以其獨(dú)有的波長(zhǎng)編碼和易構(gòu)成準(zhǔn)分布式傳感網(wǎng)絡(luò)的特性，受到廣泛的關(guān)注和應(yīng)用。但現(xiàn)有的FBG傳感解調(diào)方法大部分是將波長(zhǎng)轉(zhuǎn)化為強(qiáng)度、相位等其它物理量來(lái)測(cè)量，受傳輸損耗和光功率波動(dòng)等因素影響嚴(yán)重，而直接波長(zhǎng)解調(diào)的系統(tǒng)則較少，還存在集成度不高、價(jià)格昂貴等問(wèn)題，，阻礙了FBG在實(shí)際工程中的應(yīng)用。因此，本文建立了一套FBG直接波長(zhǎng)解調(diào)系統(tǒng)，該系統(tǒng)具有便于集成、成本低、穩(wěn)定性好等優(yōu)點(diǎn)，能夠滿足實(shí)際應(yīng)用的需要。 首先，本論文基于FBG傳感器的基本工作原理，利用分布式反饋（DFB）激光器的波長(zhǎng)調(diào)諧特性與固定Fabry-Perot標(biāo)準(zhǔn)具的波長(zhǎng)選擇特性，設(shè)計(jì)了一種基于可調(diào)諧DFB激光器動(dòng)態(tài)掃描的FBG波長(zhǎng)解調(diào)系統(tǒng)方案，并從理論上說(shuō)明了該方案的原理以及可行性。然后，在理論研究的基礎(chǔ)上，搭建了基于可調(diào)諧DFB激光器動(dòng)態(tài)掃描的FBG波長(zhǎng)解調(diào)系統(tǒng)的實(shí)驗(yàn)平臺(tái)，重點(diǎn)研究了可調(diào)諧DFB激光器的波長(zhǎng)掃描特性與固定Fabry-Perot標(biāo)準(zhǔn)具的特定波長(zhǎng)透射特性，研究發(fā)現(xiàn)：由于DFB激光器并非是理想地線性波長(zhǎng)掃描，導(dǎo)致輸出峰值間隔不等的Fabry-Perot標(biāo)準(zhǔn)具透射譜，而利用二次多項(xiàng)式擬合波長(zhǎng)與掃描時(shí)間點(diǎn)的擬合度達(dá)到0.999以上。同時(shí)，針對(duì)FBG與Fabry-Perot標(biāo)準(zhǔn)具的光譜特點(diǎn)，研究了現(xiàn)有的尋峰算法，提出先直接尋峰后高斯擬合的方法來(lái)處理FBG與Fabry-Perot標(biāo)準(zhǔn)具的時(shí)域信號(hào)，結(jié)合二項(xiàng)式擬合算法，建立了該系統(tǒng)的完整解調(diào)算法；并采用C語(yǔ)言和LabVIEW聯(lián)合編程的方式，編寫出該系統(tǒng)的數(shù)據(jù)處理程序，對(duì)由實(shí)驗(yàn)平臺(tái)采集到的時(shí)域信號(hào)進(jìn)行數(shù)據(jù)讀取、算法處理、結(jié)果顯示，該程序具有便于操作的交互式數(shù)據(jù)處理界面，且易于后續(xù)的開(kāi)發(fā)與優(yōu)化。最后，經(jīng)過(guò)標(biāo)定試驗(yàn)的研究得出，該系統(tǒng)的分辨率為1pm、測(cè)量精度為±10pm、測(cè)量范圍為1547~1552nm、相對(duì)誤差為0.26%，符合FBG應(yīng)用的行業(yè)標(biāo)準(zhǔn)。
[Abstract]:Fiber Bragg grating (FBG) sensor is characterized by its unique wavelength coding and easy to form a quasi-distributed sensor network. However, most of the existing demodulation methods of FBG sensor are measured by conversion of wavelength to intensity, phase and other physical quantities, which are seriously affected by transmission loss and optical power fluctuation. However, the direct wavelength demodulation system has few problems, such as low integration, high price and so on, which hinders the application of FBG in practical engineering. Therefore, a set of FBG direct wavelength demodulation system is established in this paper. The system has the advantages of easy integration, low cost, good stability and can meet the needs of practical applications. Firstly, based on the basic principle of FBG sensor, the wavelength tuning characteristics of distributed feedback FBG laser and the wavelength selection characteristics of fixed Fabry-Perot standard are used in this paper. A scheme of FBG wavelength demodulation system based on dynamic scanning of tunable DFB laser is designed, and the principle and feasibility of the scheme are explained theoretically. Then, on the basis of theoretical research. The experimental platform of FBG wavelength demodulation system based on dynamic scanning of tunable DFB laser is built. The wavelength scanning characteristics of tunable DFB lasers and the specific wavelength transmission characteristics of fixed Fabry-Perot standard devices are mainly studied. It is found that because DFB laser is not an ideal linear wavelength scanning, Fabry-Perot standard with different output peak interval has transmission spectrum. The fitting degree of wavelength and scanning time point by quadratic polynomial is more than 0.999. At the same time, the spectral characteristics of FBG and Fabry-Perot standard are analyzed. In this paper, the existing peak finding algorithm is studied, and a direct peak searching and Gao Si fitting method is proposed to deal with the time domain signals of FBG and Fabry-Perot standard, combined with binomial fitting algorithm. The complete demodulation algorithm of the system is established. The data processing program of the system is written by using C language and LabVIEW, and the time domain signal collected by the experiment platform is read, processed by algorithm, and the result is displayed. The program has an interactive data processing interface which is easy to operate, and is easy to be developed and optimized. Finally, the resolution of the system is 1 pm and the measurement accuracy is 鹵10 pm. The range of measurement is 1547 ~ 1552 nm and the relative error is 0.26, which conforms to the industry standard of FBG application.
【學(xué)位授予單位】：哈爾濱理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN248

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本文編號(hào)：1390984