论文摘要
本文从Bragg光纤的计算方法及特性入手,进一步研究了单模Bragg光纤芯区存在损耗时的场分布和有效折射率,并在此基础上提出了一种新型的采用空芯Bragg光纤作为吸收池的光纤气体传感器。通过计算得到了空芯Bragg光纤气体传感器的相对灵敏系数,从而为高灵敏度的全光纤型气体传感器的设计和实施提供了理论依据。本文的主要內容如下: 1) 介绍了光纤气体传感器的一般原理,通过和几种其他类型的光纤气体传感器进行比较,得出了空芯Bragg光纤气体传感器具有的优点。 2) 介绍了Bragg光纤的导光机制、模式特征及实验进展。并详细描述了研究Bragg光纤的几种计算方法:传输矩阵法,渐近法和加略金法。 3) 运用解析法和微扰法求解了空芯Bragg光纤气体传感器的相对灵敏系数,所得结果是现有的实芯光子晶体光纤气体传感器的20倍左右。由于场分布主要集中在芯区,对气体吸收较为敏感,因此,这种光纤气体传感器具有灵敏度高、响应快速、结构简单的特点。耦合多个波长可实现对多种气体同时测量。
论文目录
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