以空芯光子带隙光纤作气室的全光纤甲烷检测  

All Fiber Detection of Methane with Hollow Core Photonic Bandgap Fiber as Gas Chamber

作　　者：王书涛[1] 刘铭华[1] 曾秋菊[1] 王志芳[1] 王兴龙[1] 陈东营 魏蒙[1] 

机构地区：[1]燕山大学电气工程学院,河北秦皇岛066004

出　　处：《光电工程》2015年第3期1-6,共6页Opto-Electronic Engineering

基　　金：国家自然科学基金(61201110)资助项目

摘　　要：以空芯光子带隙光纤(PBGF)作为气体传感部件,分析了PBGF内部导光机制及其甲烷在纤芯缺陷区域的扩散特性,设计多段PBGF连接耦合弯曲成圈在一起组成的传感气室,构建一套全光纤甲烷浓度检测系统。引入分布式反馈光纤激光器的调控机制,采用谐波检测技术,实现了整体对全光纤甲烷浓度检测系统的优化。经实验,可证明由该传感部件组成的全光纤甲烷浓度检测系统能够实现甲烷浓度在线实时检测,并且甲烷浓度与相对强度成良好的线性关系,其线性度可达99.8%。A novel all fiber methane concentration detection system is constructed. The gas sensor was formed of the hollow core photonic bandgap fibers. The analysis was exhibited that FBGF inside light guiding mechanism and the diffusion characteristics of methane into the fiber core defect region. The design of the gas sensing cell was completed by multi segment PBGF connection coupled bending loop in the sensing chamber together, and then constructed the all fiber methane concentration detecting system. The regulation mechanism of distributed feedback fiber laser was brought into the system and the harmonic detection technology was used to realize the all optical fiber methane concentration detecting system optimization. The experimental result proves that the all fiber methane concentration detecting system composed of the sensing element can realize online real-time detection of methane concentration, and there is an approximate linear relation between the relative intensity and methane concentrations, the linearity up to 99.8%.

关 键 词：全光纤检测 空芯光子带隙光纤 甲烷浓度 谐波检测 

分 类 号：TN249[电子电信—物理电子学]