Jiang Yuxuan, Yi Yating, Brambilla Gilberto, Wang Pengfei
Opt Lett. 2021 Apr 1;46(7):1558-1561. doi: 10.1364/OL.418953.
A high-sensitivity ethanol gas sensor based on two microfiber couplers and the Vernier effect is examined in this Letter using the unique variation rate conversion point characteristics. The output spectrum of the two couplers connected in parallel are superimposed to form a symmetrical envelope curve, showing high responsivity to variations in the external environment. Ethanol sensitivity was achieved by coating the waist region of the coupler with a mixture of Nile red and polymethyl methacrylate. When the concentration of ethanol gas changes, the envelope spectrum shifts. Experimental results show that a high responsivity of 160 pm/ppm can be obtained by tracing the reference peaks in the envelope curve and that the response and recovery times are on the order of seconds.
本文利用独特的变化率转换点特性，研究了一种基于两个微光纤耦合器和维纳效应的高灵敏度乙醇气体传感器。将两个并联连接的耦合器的输出光谱叠加，形成一条对称的包络曲线，该曲线对外界环境变化具有高响应性。通过在耦合器的腰部区域涂覆尼罗红和聚甲基丙烯酸甲酯的混合物来实现乙醇敏感性。当乙醇气体浓度发生变化时，包络光谱会发生偏移。实验结果表明，通过追踪包络曲线中的参考峰，可以获得160 pm/ppm的高响应率，响应和恢复时间在秒级。
