An optical fiber methane gas sensing film sensor based on core diameter mismatch  

作　　者：杨建春 徐龙君 陈伟民 

机构地区：[1]Key Laboratory for Optoelectronic Technology and Systems,Ministry of Education,College of Optoelectronic Engineering,Chongqing University [2]Key Laboratory for the Exploitation of Southwest Resources and Environmental Disaster Control Engineering Ministry of Education,Chongqing University [3]Key Laboratory for the Exploitation of Southwest Resources and Environmental Disaster Control Engineering,Ministry of Education,Chongqing University

出　　处：《Chinese Optics Letters》2010年第5期482-484,共3页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.60871039);the Science and Technology Development Project of Chongqing (No.2009AC6157).

摘　　要：An optical fiber evanescent wave methane gas sensor based on core diameter mismatch is reported.The sensor consists of a multimode fiber in which a short section of standard single-mode fiber,coated with the inclusion of cryptophane molecules E in a transparent polysiloxane film,is inserted.The sensing principle is analyzed by optical waveguide theory.For different sensing film thicknesses and interaction lengths,the sensor signal is investigated within the methane concentration range of 0-14.5%（v/v）.It is shown that the sensor signal with the thickness of 5μm and the interaction length of 3 mm strengthens linearly with the increasing concentration of methane,with a slope of 0.0186.The best detection limit of the sensor for methane is 2.2%（v/v） with a response time of 90 s.This sensor is suitable for the detection of methane concentration below the critical value of 5%.An optical fiber evanescent wave methane gas sensor based on core diameter mismatch is reported.The sensor consists of a multimode fiber in which a short section of standard single-mode fiber,coated with the inclusion of cryptophane molecules E in a transparent polysiloxane film,is inserted.The sensing principle is analyzed by optical waveguide theory.For different sensing film thicknesses and interaction lengths,the sensor signal is investigated within the methane concentration range of 0-14.5%（v/v）.It is shown that the sensor signal with the thickness of 5μm and the interaction length of 3 mm strengthens linearly with the increasing concentration of methane,with a slope of 0.0186.The best detection limit of the sensor for methane is 2.2%（v/v） with a response time of 90 s.This sensor is suitable for the detection of methane concentration below the critical value of 5%.

关 键 词：Fibers Gas detectors METHANATION METHANE Multimode fibers Optical fibers Optical waveguides Signal detection SILICONES 

分 类 号：TP212.2[自动化与计算机技术—检测技术与自动化装置]