【作者】 李姗雅； 黎学明； 杨建春；

【Author】 Shanya Li;Xueming Li;Jianchun Yang;College of Chemistry and Chemical Engineering,Chongqing University;College of Optoelectronic Engineering,Chongqing University;

【机构】 重庆大学化学化工学院； 重庆大学光电工程学院；

【摘要】 光纤气体传感器是一类结构简单、体积小、抗强电磁干扰强、适宜易燃易爆环境的传感器。论文提出一种基于反射式无芯光纤多模干涉型光纤甲烷传感器,该传感器含单模光纤熔接一段端面镀镍(Ni)反射膜的无芯光纤[1],并在无芯光纤表面涂覆敏感甲烷的笼形分子A、聚乙烯丙烯腈(SAN)树脂等纳米双层薄膜。利用Optiwave Software软件数值模拟反射式无芯光纤多模干涉型光纤甲烷传感过程,研究无芯光纤长度2、3、4cm时传感器反射光谱信号变化,表明长度为3cm时干涉谱波谷的波长值随敏感膜折射率变化灵敏度最高;无芯光纤长度增加,传感器灵敏度降低;敏感膜折射率减小(甲烷气体浓度增加)时,干涉峰的波长红移。实验研究光纤长度为3cm时传感器在甲烷浓度0.3~3.5%(v/v)范围内干涉谱波长移动特征,发现干涉谱波长红移量与甲烷气体浓度成正比,斜率(灵敏度)为0.4624,相关系数R2为0.958,灵敏度较高。更多还原

【Abstract】 We propose a fiber methane sensor based on an intermodal interference of reflectivity, which is fabricated by plating nickel(Ni) on the end of non-core fiber and then the other end of non-core fiber splice to standard optical fiber and coating nano-film on the surface of non-core fiber. The sensing region of non-core fiber length were 2 cm, 3 cm and 4 cm when using the optiwave software to simulate the sensing process of the gas sensor The results showed that sensitivity was the highest when the non-core fiber length was 3cm.Our research indicated that the wavelength red-shift value of interference spectral peak was in direct proportion to methane gas concentration and the slope(sensitivity) and correlation coefficient were 0.4624 and 0.958,when the length of sensing areas were 3cm within gas concentration range 0.3~3.5%(v/v).更多还原