【摘要】：光纖光柵在光通信、光傳感、光測量等方面都有重要應(yīng)用,尤其在航空航天和橋梁監(jiān)測等結(jié)構(gòu)健康監(jiān)測領(lǐng)域得到了廣泛應(yīng)用。然而,傳統(tǒng)的光纖光柵無法在強紫外、強輻射以及高溫環(huán)境下長期工作,原因是光柵結(jié)構(gòu)會受到影響甚至破壞。針對這一問題,近年來一種新型的螺旋型手征光纖光柵(Chiral Fiber Gratings CFG)逐漸受到了研究人員的重視。本論文的工作內(nèi)容圍繞著扭轉(zhuǎn)光纖光柵而展開,主要包括兩個方面,一是研究光纖在生產(chǎn)過程中,熔融條件下,高速扭轉(zhuǎn)截面非圓對稱光纖制作而成的螺旋型手征光纖光柵,其光譜特性及傳感應(yīng)用。二是討論了生產(chǎn)過程中未扭轉(zhuǎn)的普通光柵在扭轉(zhuǎn)傳感器中的應(yīng)用。首先,闡述光纖光柵的工作原理,根據(jù)耦合模理論,詳細分析了雙螺旋型長周期手征光纖光柵(Chiral Long Period Fiber Gratings CLPG)的光譜特性和耦合特性,模擬了相應(yīng)的透射譜,并實驗測試了該光柵的透射譜。在此基礎(chǔ)上,利用相位匹配條件,計算了特定諧振波長所對應(yīng)的扭轉(zhuǎn)周期及扭轉(zhuǎn)率,模擬了相應(yīng)的透射譜,并討論了光柵的設(shè)計參數(shù)對透射譜的影響。分析了雙螺旋型CLPG的應(yīng)變傳感特性,研究表明其傳感特性與傳統(tǒng)的長周期光纖光柵類似,諧振波長受應(yīng)變變化會發(fā)生偏移,并且波長的偏移量與應(yīng)變呈線性關(guān)系,靈敏度為0.828pm/με。宓同時,分析了彈光系數(shù)對透射譜和靈敏度的影響。根據(jù)瓊斯矩陣和傳輸矩陣法,理論分析和數(shù)值模擬扭轉(zhuǎn)FBG(光纖布拉格光柵Fiber Bragg Gratings)與PDL(偏振相關(guān)損耗Polarization Dependent Loss)響應(yīng)的關(guān)系,通過測量PDL幅值變化,可實現(xiàn)不受應(yīng)變和溫度干擾,扭轉(zhuǎn)傳感的測量。此外,這可以同時獲得扭轉(zhuǎn)方向和扭轉(zhuǎn)角兩個量,實驗結(jié)果和數(shù)值模擬較符,扭轉(zhuǎn)靈敏度為0.955 dB/rad。
[Abstract]:Fiber Bragg grating (FBG) has important applications in optical communication, optical sensing and optical measurement, especially in the field of structural health monitoring such as aerospace and bridge monitoring. However, the traditional fiber gratings can not work in strong ultraviolet, strong radiation and high temperature environment for a long time, because the structure of the grating will be affected or even destroyed. In order to solve this problem, a new type of chiral fiber grating (chiral fiber Gratings CFG) has been paid more and more attention by researchers in recent years. The work of this thesis is focused on torsional fiber gratings, including two aspects. One is to study the helical chiral fiber gratings fabricated by high-speed torsional non-circular symmetric fiber in the production process and melting condition. Its spectral characteristics and sensing applications. Secondly, the application of untwisted grating in torsion sensor is discussed. Firstly, the principle of fiber Bragg grating is described. Based on the coupled mode theory, the spectral and coupling characteristics of the chiral long period fiber Gratings CLPG are analyzed in detail, and the corresponding transmission spectra are simulated. The transmission spectrum of the grating is measured experimentally. On this basis, the torsion period and torsion rate corresponding to a particular resonant wavelength are calculated by using phase matching conditions, the corresponding transmission spectra are simulated, and the influence of the design parameters of the grating on the transmission spectrum is discussed. The strain sensing characteristics of double helical fiber gratings are analyzed. It is shown that the sensing characteristics are similar to those of the traditional long period fiber gratings, and the resonant wavelength will be offset by strain variation, and the deviation of the wavelength is linearly related to the strain, and the sensitivity is 0.828pm/ 渭 蔚. At the same time, the influence of elastic-optical coefficient on transmission spectrum and sensitivity is analyzed. According to Jones matrix and transfer matrix method, the relationship between fiber Bragg grating (FBG) and PDL (polarization dependent loss) response is analyzed and numerically simulated. The measurement of a torsion sensor. In addition, the torsional direction and torsion angle can be obtained simultaneously. The experimental results are compared with the numerical simulation. The torsional sensitivity is 0.955 dB / Rrad.
【學位授予單位】：南京師范大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN253

【參考文獻】

相關(guān)期刊論文 前3條

1 歐啟標;代國勇;彭宇林;萬理;譚組印;;膜層厚度對長周期光纖光柵諧振波長的影響[J];激光與紅外;2012年06期

2 楊利;李成;蘇覺;錢景仁;;全光纖型圓偏振起偏器的工作原理及理論分析[J];中國科學技術(shù)大學學報;2010年10期

3 關(guān)壽華;宋世德;孫炳全;于清旭;劉曉東;;長周期光纖光柵應(yīng)變特性的理論與實驗研究[J];石油化工高等學校學報;2005年04期

，

本文編號：2132790