In this paper, a reflective photonic crystal fiber (PCF) sensor probe for temperature measurement has been demonstrated both theoretically and experimentally. The performance of the device depends on the intensity modulation of the optical signal by liquid mixtures infiltrated into the air holes of commercial LMA-8 PCFs. The effective mode field area and the confinement loss of the probe are both proved highly temperature-dependent based on the finite element method (FEM). The experimental results show that the reflected power exhibits a linear response with a temperature sensitivity of about 1 dB/°C. The sensor probe presents a tunable temperature sensitive range due to the concentration of the mixture components. Further research illustrates that with appropriate mixtures of liquids, the probe could be developed as a cryogenic temperature sensor. The temperature sensitivity is about 0.75 dB/°C. Such a configuration is promising for a portable, low-power and all-in-fiber device for temperature or refractive index monitoring in chemical or biosensing applications.
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机译：在本文中，已在理论和实验上证明了用于温度测量的反射式光子晶体光纤（PCF）传感器探头。设备的性能取决于渗透到商用LMA-8 PCF气孔中的液体混合物对光信号的强度调制。基于有限元方法（FEM），有效模场面积和探头的限制损耗都与温度高度相关。实验结果表明，反射功率表现出线性响应，温度灵敏度约为1 dB /°C。由于混合成分的浓度，传感器探头呈现出可调的温度敏感范围。进一步的研究表明，使用适当的液体混合物，可以将探针开发为低温温度传感器。温度灵敏度约为0.75 dB /°C。这种配置对于用于化学或生物传感应用中的温度或折射率监测的便携式，低功率和全光纤设备是有希望的。
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