High-sensitivity long-period fiber grating sensor with SAN/cryptophane A for coal mine gas detection  

作　　者：杨建春 黄静 黎学明 李姗雅 罗彬彬 陶传义 陈伟民 

机构地区：[1]Key Laboratory for Optoelectronic Technology and Systems of Education Ministry of China,College of Optoelectronic Engineering,Chongqing University [2]College of Chemistry and Chemical Engineering,Chongqing University [3]Department of Applied Physics,Chongqing University of Technology

出　　处：《Chinese Optics Letters》2013年第8期14-17,共4页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No. 61271059);the Natural Science Foundation Project of Chongqing (No. 2010BB4246);the Science and Technology Development Project of Chongqing (No. CSTC2012gg-yyjs90007)

摘　　要：A high-sensitivity long-period fiber grating （LPFG） methane sensor that contains a compact and uniform styrene-acrylonitrile （SAN）/cryptophane A nanofilm is presented. The sensor is prepared by using an automatic dip-coater in a solution of cryptophane A, SAN resin dissolved in ortho-dichlorobenzene, a low- volatile solvent. The effect of film thickness on the LPFG＇s resonant wavelength is thoroughly investigated. The optimum sensor among the three LPFGs with different film thicknesses is directly used to detect the methane concentration in a coal mine gas sample. The results indicate that the sensors with film thicknesses of 484 to 564 nm exhibit a redshifted resonant wavelength when the methane concentration is increased from 0% to 3.5% （vol）. The data demonstrates that the sensor with a film thickness of 484 nm has remarkable sensitivity （~0.633 nm%-X）, and its detection limit can reach 0.2%. The methane concentrations determined by our sensor are consistent with those obtained by gas chromatography.A high-sensitivity long-period fiber grating （LPFG） methane sensor that contains a compact and uniform styrene-acrylonitrile （SAN）/cryptophane A nanofilm is presented. The sensor is prepared by using an automatic dip-coater in a solution of cryptophane A, SAN resin dissolved in ortho-dichlorobenzene, a low- volatile solvent. The effect of film thickness on the LPFG＇s resonant wavelength is thoroughly investigated. The optimum sensor among the three LPFGs with different film thicknesses is directly used to detect the methane concentration in a coal mine gas sample. The results indicate that the sensors with film thicknesses of 484 to 564 nm exhibit a redshifted resonant wavelength when the methane concentration is increased from 0% to 3.5% （vol）. The data demonstrates that the sensor with a film thickness of 484 nm has remarkable sensitivity （~0.633 nm%-X）, and its detection limit can reach 0.2%. The methane concentrations determined by our sensor are consistent with those obtained by gas chromatography.

关 键 词：Coal mines Diffraction gratings Film thickness Gas chromatography METHANATION Methane STYRENE 

分 类 号：TP212.14[自动化与计算机技术—检测技术与自动化装置] TD712.55[自动化与计算机技术—控制科学与工程]