摘要
光子晶体光纤是近年来一种比较新型的光纤,它主要包括改进的全内反射型光子晶体光纤和带隙型光子晶体光纤两大类。本论文主要研究的是带隙型光子晶体光纤。带隙型光子晶体光纤以其独特的结构和导光机制,使其具有其他很多普通光纤无法比拟的优良特性,拥有广泛的应用前景。光纤传感器具有灵敏度高、防磁、防爆、远程控制等优点,能够解决常规检测技术难以完全胜任的检测问题。而将带隙型光子晶体光纤应用于光纤气体传感,将会使得气体传感与检测的灵敏度得到进一步的提高。本论文主要进行了以下几方面的工作：
1.总结了近些年来光子晶体光纤和光纤传感器的一些研究进展；综述了光子晶体光纤、带隙型光子晶体光纤的导光机制、特性及应用等方面以及传感器和光纤传感器方面的相关知识。
2.从分析将带隙型光子晶体光纤应用于光纤传感器的优势出发,主要针对一氧化碳、甲烷和乙炔气体,根据其气体特性及传感器对带隙型光子晶体光纤的性能要求,利用平面波展开法和矢量有限元法,通过分析计算,得出所需的光纤的基本参数,即纤芯的半径、空气孔的半径和间距,使其在纤芯中的传输率达到90%以上,提高其检测的灵敏度。
Photonic crystal fiber (PCF for short) is a new class of optical fiber developed in recent years, divided into modified-total internal reflection photonic crystal fiber (M-TIR-PCF for short) and photonic bandgap photonic crystal fiber (PBG-PCF for short). We studied on PBG-PCF in this dissertation. Due to its special structure and light propagation mechanism, PBG-PCF performs superiorly to common fibers in many aspects, and it presents wide application prospects in many fields. The gas sensors provide high sensitivity, immunity to electromagnetic field, remote control and using under difficult circumstances. The gas sensors using hollow core photonic bandgap photonic crystal fiber can improve the detection sensitivity further. The main contents of this dissertation are as follows:
1. Sum up the research process on the application of the photonic crystal fiber and fiber-optic senor. The optical basic principles, excellent features, applications of the PCF and PBG-PCF have been summarized. And we have summarized something about fiber-optic sensor in this dissertation.
2. Through analyzed the advantages of the gas sensors using hollow core photonic bandgap photonic crystal fiber, the specific parameters are calculated for the hollow core photonic bandgap fibers which are used for the gas sensors by means of plane wave method and finite element method for applying the hollow core photonic bandgap fiber to the CO, CH4, C2H2 gas sensing and detecting. The specific parameters include the radius of the core of fiber, the radius and distance between two air holes. The results show that the in-core transmission power is more than 90%, which indicate that it can improve the detection sensitivity.
引文
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