本文選題：同軸電纜布拉格電柵　切入點(diǎn)：電柵傳感　出處：《天津大學(xué)》2014年碩士論文

【摘要】：目前,光纖光柵傳感器在結(jié)構(gòu)健康監(jiān)測系統(tǒng)中得到了廣泛的應(yīng)用。但是由于光纖光柵易碎,不能承受大應(yīng)變力的缺點(diǎn)不能滿足大應(yīng)變力測量的要求。本文采用的同軸電纜布拉格電柵,是依據(jù)光子晶體結(jié)構(gòu)方式和光纖布拉格光柵的原理,對同軸電纜進(jìn)行鉆孔形成的柵結(jié)構(gòu)。對同軸電纜進(jìn)行鉆孔破壞了其阻抗連續(xù)性,導(dǎo)致在同軸電纜布拉格電柵內(nèi)傳播的電磁波發(fā)生發(fā)射,其特性和光纖布拉格光柵相似,但是電柵具有更大的尺寸,可以承受更大的張力,可以進(jìn)行大標(biāo)距測量的特點(diǎn),彌補(bǔ)了光纖光柵易碎,可測應(yīng)變力小,不能進(jìn)行大標(biāo)距測量的不足。同軸布拉格電柵具有和光纖光柵相似的傳輸和反射特性,更具有光纖光柵沒有的可承受大應(yīng)變力的能力,但是國內(nèi)外鮮有針對同軸布拉格電柵進(jìn)行的理論分析和仿真。本文首先根據(jù)傳輸線理論和模式耦合理論對同軸布拉格電柵的基本原理進(jìn)行了闡述,分析了同軸布拉格電柵的電柵效應(yīng)的機(jī)理。然后,對同軸布拉格電柵的結(jié)構(gòu)進(jìn)行了介紹,并利用傳輸線原理對同軸布拉格電柵的反射系數(shù)進(jìn)行了推導(dǎo)。接下來采用Ansoft HFSS電磁仿真軟件對同軸布拉格電柵進(jìn)行了建模仿真,Ansoft HFSS是以有限元分析方法作為數(shù)值求解電磁場的基礎(chǔ),憑借強(qiáng)大的分析性能、友好簡潔的設(shè)計(jì)界面和后處理器的特點(diǎn)可以對任意形狀的三維結(jié)構(gòu)進(jìn)行電磁場分析。先對均勻的同軸布拉格電柵進(jìn)行仿真,仿真結(jié)果和實(shí)驗(yàn)結(jié)果進(jìn)行對比,頻率特性基本一致,因此仿真結(jié)果可以作為電柵特性研究的依據(jù)。最后對相移同軸布拉格電柵進(jìn)行仿真,可知在相同參數(shù)條件下,相移同軸布拉格電柵比均勻同軸布拉格電柵的線寬小,更有利于傳感應(yīng)用。又對相移同軸布拉格電柵不同的鉆孔數(shù)目、不同的鉆空深度,鉆孔直徑等參數(shù)進(jìn)行仿真,對相移同軸布拉格電柵進(jìn)行參數(shù)優(yōu)化,進(jìn)一步減小線寬,提高傳感精度。
[Abstract]:At present, fiber Bragg grating sensors have been widely used in structural health monitoring system.However, because fiber Bragg grating is fragile, it can not withstand large strain force and can not meet the requirement of large strain force measurement.The coaxial cable Bragg grating used in this paper is based on the photonic crystal structure and the principle of fiber Bragg grating.Drilling the coaxial cable destroys its impedance continuity, which results in the emission of electromagnetic waves propagating in the Bragg grid of the coaxial cable. The characteristics of the electromagnetic wave are similar to those of the fiber Bragg grating, but the grid has a larger size.It can withstand larger tension and can be used to measure large distance, which makes up for the weakness of fiber Bragg grating (FBG) being fragile, and the measuring strain is small, so it can not be measured at large distance.Coaxial Bragg gratings have similar transmission and reflection characteristics as fiber Bragg gratings, and have the capability of withstanding large strain forces that fiber Bragg gratings do not. However, there are few theoretical analyses and simulations on coaxial Bragg gratings at home and abroad.In this paper, the basic principle of coaxial Bragg gratings is described based on transmission line theory and mode coupling theory, and the mechanism of grid effect of coaxial Bragg gratings is analyzed.Then, the structure of coaxial Bragg grating is introduced, and the reflection coefficient of coaxial Bragg grid is deduced by using the principle of transmission line.Next, Ansoft HFSS electromagnetic simulation software is used to model and simulate the coaxial Bragg gate. Ansoft HFSS is based on finite element analysis method to solve electromagnetic field numerically.The friendly and concise design interface and the characteristics of the post processor can be used to analyze the electromagnetic field of three-dimensional structure with arbitrary shape.First, the uniform coaxial Bragg gate is simulated, and the simulation results are compared with the experimental results. The frequency characteristics are basically the same, so the simulation results can be used as the basis for the study of the grid characteristics.Finally, the phase shift coaxial Bragg gate is simulated. It is shown that the line width of the phase-shifted coaxial Bragg gate is smaller than that of the uniform coaxial Bragg gate under the same parameters, which is more favorable for sensing applications.The parameters of phase shift coaxial Bragg grating such as the number of boreholes the different drilling depth and the diameter of the borehole are simulated. The parameters of the phase-shifting coaxial Bragg grid are optimized to further reduce the line width and improve the sensing accuracy.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TP212;TM248.3

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 何俊;周智;董惠娟;張廣玉;歐進(jìn)萍;;靈敏度系數(shù)可調(diào)布拉格光柵應(yīng)變傳感器的設(shè)計(jì)[J];光學(xué)精密工程;2010年11期

2 倪培根;;光子晶體制備技術(shù)和應(yīng)用研究進(jìn)展[J];物理學(xué)報(bào);2010年01期

3 姜紹飛;;結(jié)構(gòu)健康監(jiān)測-智能信息處理及應(yīng)用[J];工程力學(xué);2009年S2期

4 錢景仁;;耦合模理論及其在光纖光學(xué)中的應(yīng)用[J];光學(xué)學(xué)報(bào);2009年05期

5 何浩祥;閆維明;馬華;王卓;;結(jié)構(gòu)健康監(jiān)測系統(tǒng)設(shè)計(jì)標(biāo)準(zhǔn)化評述與展望[J];地震工程與工程振動(dòng);2008年04期

6 常天英;李東升;隋青美;賈磊;;光纖光柵傳感技術(shù)在分岔隧道模型中的實(shí)驗(yàn)研究[J];儀器儀表學(xué)報(bào);2008年01期

7 黃艷紅;高曉蓉;杜路泉;;光纖光柵傳感器在橋梁缺陷檢測和結(jié)構(gòu)健康監(jiān)測中的應(yīng)用[J];鐵道技術(shù)監(jiān)督;2007年11期

8 楊亦飛,劉波,張偉剛,韋占雄,殷昀虢,開桂云,董孝義;工程化光纖光柵應(yīng)變傳感器的制作及其應(yīng)用[J];儀表技術(shù)與傳感器;2005年04期

9 孫安,喬學(xué)光,賈振安,郭團(tuán),陳長勇;聚合物封裝光纖布拉格光柵傳感器溫度壓力特性研究[J];中國激光;2005年02期

10 鄧開發(fā),是度芳,蔣美萍,李承芳;光子晶體研究進(jìn)展[J];量子電子學(xué)報(bào);2004年05期

相關(guān)博士學(xué)位論文 前1條

1 高占鳳;大型結(jié)構(gòu)健康監(jiān)測中信息獲取及處理的智能化研究[D];北京交通大學(xué);2010年

相關(guān)碩士學(xué)位論文 前3條

1 陳亮;結(jié)構(gòu)健康監(jiān)測物聯(lián)網(wǎng)系統(tǒng)的云計(jì)算應(yīng)用研究[D];哈爾濱工業(yè)大學(xué);2013年

2 楊君琦;應(yīng)變傳感器的應(yīng)變傳遞理論及傳感特性研究[D];中南大學(xué);2013年

3 李淵;同軸電纜布拉格電柵[D];大連理工大學(xué);2012年

，

本文編號(hào)：1701948