用Bragg光纤测量气体浓度  

Measurement for Gas Concentration by Bragg Fiber

作　　者：贾清[1] 李慧生[1] 马维光[1] 薛文瑞[1] 周国生[1] 

机构地区：[1]山西大学物理电子工程学院,山西太原030006

出　　处：《量子光学学报》2005年第2期84-87,共4页Journal of Quantum Optics

基　　金：国家自然科学基金(60244006);山西省自然科学基金(20041036)

摘　　要：基于气体的光谱吸收特性,本文提出了一种采用Bragg空芯光纤作为吸收池的新型光纤气体传感器。运用解析法和微扰分析法求解了Bragg空芯光纤中的相对灵敏系数。由于场分布主要集中在芯区,对气体损耗较为敏感,因此,这种光纤气体传感器具有灵敏度高、快速响应、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。Based on the characteristic of spectrum absorption of gas, we propose a new type of optical fiber gas sensor for measurment of gas concentration. Hollow Bragg fiber is used as the absorption cell of optical fiber gas sensor. Using analysis method and perturbation method we calculate the relative sensitivity of hollow Bragg fiber gas sensor. The results show that the field is centralized in the core and is sensitive to the gas loss. So the advantages of this new type of optical fiber gas sensor are high sensitivity, short response time and simple structure. This gas sensor can measure different kinds of gases simultaneously with different wavelength lasers.

关 键 词：BRAGG光纤 气体传感器 光谱吸收 微扰法 

分 类 号：O431[机械工程—光学工程]