發(fā)布時間：2018-08-23 09:25

【摘要】：近年來,光纖傳感器因其獨特優(yōu)勢得到了廣泛的關(guān)注與研究,已成功地應(yīng)用于航空航天、建筑工程、生物醫(yī)學(xué)等多個領(lǐng)域。然而,如何獲得結(jié)構(gòu)簡單、性能優(yōu)良的傳感器,已成為制約光纖傳感領(lǐng)域發(fā)展的“瓶頸”。包層模諧振光纖傳感器利用光纖纖芯模與包層模的相互耦合實現(xiàn)被測物理量的檢測,具有結(jié)構(gòu)簡單、模式激發(fā)可控、靈敏度高等優(yōu)點。因此,深入探索包層模諧振光纖傳感特性具有重要意義。本文基于耦合模理論,深入分析了三包層石英特種光纖(TCQSF)的包層模諧振現(xiàn)象及其傳感特性,具體內(nèi)容包括:首先,介紹了課題研究的背景及意義,分析了模式耦合型光纖傳感器的國內(nèi)外研究現(xiàn)狀,并介紹了其相關(guān)的制備方法與傳感原理,對本文研究內(nèi)容進(jìn)行了闡述。其次,介紹了用于分析多包層光纖的正規(guī)模理論與耦合模理論;利用耦合模理論建立了TCQSF的等效模型,并分析了該等效模型的電場分布、特征方程和色散曲線,建立了傳感器的接入長度與傳輸譜線之間的關(guān)系。再次,研究了基于TCQSF的包層模諧振傳感器的溫度特性,分析了溫度變化過程中熱光效應(yīng)與熱膨脹效應(yīng)對TCQSF結(jié)構(gòu)參數(shù)的影響,實驗研究并建立了不同溫度與波長漂移的關(guān)系模型。然后,研究了基于TCQSF的包層模諧振傳感器的曲率特性,分析了不同曲率情況下的TCQSF中各模式的場分布,實驗研究并建立了不同曲率與波長漂移的關(guān)系模型。最后,研究了基于TCQSF與單模光纖錯位熔接的傳感器特性,分析了不同錯位量與折射率靈敏度之間的關(guān)系,實驗研究并探討了傳感器的折射率和溫度特性。
[Abstract]:In recent years, optical fiber sensors have been widely studied because of their unique advantages, and have been successfully applied in many fields, such as aerospace, architectural engineering, biomedicine and so on. However, how to obtain sensors with simple structure and excellent performance has become a bottleneck in the field of optical fiber sensing. Cladding mode resonant optical fiber sensor uses the coupling of fiber core mode and cladding mode to detect the measured physical quantity, which has the advantages of simple structure, controllable mode excitation and high sensitivity. Therefore, it is of great significance to explore the sensing characteristics of cladding mode resonant fiber. Based on the coupled mode theory, the cladding mode resonance phenomenon and its sensing characteristics of three-cladding quartz fiber (TCQSF) are deeply analyzed in this paper. The main contents are as follows: firstly, the background and significance of the research are introduced. This paper analyzes the research status of mode coupled fiber optic sensor at home and abroad, introduces its preparation method and sensing principle, and expounds the research content of this paper. Secondly, the positive scale theory and coupling mode theory used to analyze multicladding fiber are introduced, the equivalent model of TCQSF is established by using coupling mode theory, and the electric field distribution, characteristic equation and dispersion curve of the equivalent model are analyzed. The relationship between the connection length of the sensor and the transmission line is established. Thirdly, the temperature characteristic of cladding mode resonant sensor based on TCQSF is studied, the influence of thermo-optical effect and thermal expansion effect on the structure parameters of TCQSF is analyzed, and the relationship model between different temperature and wavelength shift is established. Then, the curvature characteristics of cladding mode resonant sensor based on TCQSF are studied, the field distribution of each mode in TCQSF with different curvature is analyzed, and the relationship between different curvature and wavelength drift is studied and established experimentally. Finally, the characteristics of the sensor based on TCQSF and single-mode optical fiber dislocation welding are studied, and the relationship between different mislocations and refractive index sensitivity is analyzed, and the refractive index and temperature characteristics of the sensor are studied and discussed experimentally.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TN253

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本文編號：2198617