【摘要】 以光子晶体光纤(PCF)为研究对象,以提高气体测量灵敏度为研究目标,提出一种反射式的光纤气体传感技术.首先,利用宽谱光源谐波检测技术,并结合实际应用需求,设计了基于空芯PCF的反射式气体传感系统,并详细分析了系统的工作原理.然后,针对空芯PCF与单模光纤耦合困难、气体填充时间长的问题,设计了集密封、固定及连接于一体的机械耦合装置作为测量气室.最后,以乙炔气体为例,测试了该系统的传感特性,体积分数分辨力可达0.02%,最大相对误差为1.39%.该技术将进一步推动PCF在气体传感中的应用,并为其在实际气体浓度测量中的应用提供了理论和实验基础.更多还原

【Abstract】 In order to enhance the gas measurement sensitivity,a reflective optical fiber gas sensing technology was proposed using photonic crystal fiber( PCF). Firstly,the harmonic detection technology of broadband source was used in combination with the practical application demands. Then,aimed at the problems of coupling between hollow core PCF and single mode fiber,and the long infiltrating time of measured gas,a new measured gas chamber was designed,which integrated seal,fixation and connection. Finally,taking acetylene gas as an example,the sensing properties of the proposed sensor were measured. Experiment results demonstrated that the minimum detectable concentration could be as accurate as 0. 02%,and the maximum relative error was 1. 39%. The proposed technology can further promote the applications of PCF in gas sensing,and lay the theoretical and experimental foundations for its practical applications.更多还原