Dual-core photonic crystal fiber temperature sensor based on vernier effect
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摘要: 设计了一种基于双芯光纤耦合效应和游标效应的高灵敏度温度传感器，传感器是由2个相差一定长度的双芯光子晶体光纤和单模光纤级联构成。双芯光子晶体光纤通过级联实现游标效应，同时对纤芯中间的气孔填充乙醇实现温度传感。仿真结果表明，该温度传感器在35 ℃～45 ℃范围内的平均温度灵敏度可达−20.37 nm/℃。与单纯依靠双芯光子晶体光纤能量耦合效应的传感器相比，该传感器的温度检测灵敏度提高了10倍。Abstract: A high-sensitivity temperature sensor based on dual-core fiber coupling effect and vernier effect was proposed. The sensor was composed of two fibers which with a certain length difference, they were dual-core photonic crystal fiber and single mode fiber. The vernier effect was achieved by dual-core photonic crystal fiber through the cascade, and in the meantime the temperature sensing was achieved by filling the pores with ethanol in the middle of the fiber core. The simulation results show that the average temperature sensitivity of -20.37 nm/℃ of the temperature sensor can be achieved in the temperature range of 35℃~45℃. Compared with the sensor which only depends on the energy coupling effect of dual-core photonic crystal fiber, the temperature detection sensitivity of the proposed sensor is 10 times higher.
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图 4 参考双芯PCF的透射谱、传感双芯PCF的透射谱、级联双芯PCF的透射谱和包络线
Figure 4. Transmission spectrum of reference dual-core PCF, transmission spectrum of sensing dual-core PCF, as well as transmission spectrum and envelope curve of cascaded dual-core PCF
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图 5 级联双芯PCF中光波的纵向功率分布
Figure 5. Longitudinal power distribution of light in designed cascaded dual-core PCF
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图 6 35 ℃～45 ℃范围单个传感双芯PCF和级联双芯PCF的透射谱及级联双芯PCF透射谱的包络
Figure 6. Transmission spectra of single sensing dual-core PCF, cascaded dual-core PCF and envelope curves of cascaded dual-core PCF transmission spectra in range of 35°C~45 °C
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图 7 单个双芯PCF和级联双芯PCF的温度敏感度的线性拟合曲线
Figure 7. Linear fitting curves of temperature sensitivity of single dual-core PCF and cascaded dual-core PCF
表 1 本文提出的传感器的传感性能与最近报道的方案的比较
Table 1 Comparison of sensing performance of proposed sensor with recently reported schemes
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