基于三包层石英特种光纤的包层模谐振传感特性研究

发布时间：2018-08-23 09:25

【摘要】：近年来,光纤传感器因其独特优势得到了广泛的关注与研究,已成功地应用于航空航天、建筑工程、生物医学等多个领域。然而,如何获得结构简单、性能优良的传感器,已成为制约光纤传感领域发展的“瓶颈”。包层模谐振光纤传感器利用光纤纤芯模与包层模的相互耦合实现被测物理量的检测,具有结构简单、模式激发可控、灵敏度高等优点。因此,深入探索包层模谐振光纤传感特性具有重要意义。本文基于耦合模理论,深入分析了三包层石英特种光纤(TCQSF)的包层模谐振现象及其传感特性,具体内容包括:首先,介绍了课题研究的背景及意义,分析了模式耦合型光纤传感器的国内外研究现状,并介绍了其相关的制备方法与传感原理,对本文研究内容进行了阐述。其次,介绍了用于分析多包层光纤的正规模理论与耦合模理论;利用耦合模理论建立了TCQSF的等效模型,并分析了该等效模型的电场分布、特征方程和色散曲线,建立了传感器的接入长度与传输谱线之间的关系。再次,研究了基于TCQSF的包层模谐振传感器的温度特性,分析了温度变化过程中热光效应与热膨胀效应对TCQSF结构参数的影响,实验研究并建立了不同温度与波长漂移的关系模型。然后,研究了基于TCQSF的包层模谐振传感器的曲率特性,分析了不同曲率情况下的TCQSF中各模式的场分布,实验研究并建立了不同曲率与波长漂移的关系模型。最后,研究了基于TCQSF与单模光纤错位熔接的传感器特性,分析了不同错位量与折射率灵敏度之间的关系,实验研究并探讨了传感器的折射率和温度特性。
[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.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN253

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