In this paper, a highly sensitive temperature sensor is proposed on the platform of photonic crystal fiber (filled with ethanol) and Sagnac interferometer. The sensing characteristics of the device are analyzed by the finite element method. The results show a high temperature sensitivity of 23.23 nm/°C and − 8.71 nm/°C for the fiber length of 24 cm within the temperature range of 45 °C to 60 °C. In addition, the maximum sensitivity of 29.12 nm/°C and − 18.75 nm/°C can be achieved by limiting the temperature range from 43 °C to 50 °C for the same fiber length. Additionally, the effects of structural parameter variation on sensitivity are graphically represented. At last, refractive index (RI) sensitivity, due to the temperature sensitive liquid, is also calculated and obtained average sensitivities are −72,857 nm/RIU and 45,000 nm/RIU as RI varies from 1.3485 to 1.3515. Due to the above promising results, the proposed device may find potential applications in surrounding environmental temperature detection.

本文在光子晶体光纤（装有乙醇）和Sagnac干涉仪的平台上提出了一种高灵敏度的温度传感器。器件的感测特性通过有限元方法进行分析。结果显示，在45°C至60°C的温度范围内，对于24 cm的纤维长度，其高温敏感度为23.23 nm /°C，−高温灵敏度为-8.71 nm /°C。此外，对于相同的光纤长度，通过将温度范围限制在43°C至50°C之间，可以实现29.12 nm /°C和-18.75 nm /°C的最大灵敏度。另外，用图形表示了结构参数变化对灵敏度的影响。最后，还计算了由于温度敏感液体引起的折射率（RI）灵敏度，得出的平均灵敏度为-72,857 nm / RIU和45，当RI从1.3485到1.3515时，000 nm / RIU。由于上述有希望的结果，所提出的设备可以在周围环境温度检测中找到潜在的应用。