一种基于光子晶体光纤的高灵敏度Sagnac型温度传感器建模研究  

Modelling Study of a High Sensitivity Sagnac Temperature Sensor Based on Photonic Crystal Fiber

作　　者：赵丽娟[1,2,3] 吴雨静 徐志钮 刘琪[1] ZHAO Lijuan;WU Yujing;XU Zhiniu;LIU Qi(School of Electrical and Electronic Engineering,North China Electric Power University,Baoding 071003,China;Hebei Key Laboratory of Power Internet of Things Technology,North China Electric Power University,Baoding 071003,China;Baoding Key Laboratory of Optical Fiber Sensing and Optical Communication Technology,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学电气与电子工程学院,保定071003 [2]华北电力大学河北省电力物联网技术重点实验室,保定071003 [3]华北电力大学保定市光纤传感与光通信技术重点实验室,保定071003

出　　处：《光子学报》2023年第2期111-123,共13页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.62171185,62273146);河北省自然科学基金(Nos.E2019502177,E2020502010);河北省省级科技计划(No.SZX2020034);中央高校基本科研业务费专项资金(No.2021MS072);2022年大学生科技创新培育专项(No.9101522005)。

摘　　要：为提高Sagnac型温度传感器的测温范围和灵敏度,提供了一种具有高双折射高温度灵敏度特性的光子晶体光纤设计方法。通过在光纤空气孔内填充温敏液体材料,使光纤具有良好的温敏特性。在COMSOL中建立该光子晶体光纤的电磁场模型并对光纤特性进行分析计算,利用有限元法分析结构参数对双折射和光纤双折射温度灵敏度的影响,并在所确定结构基础上研究了温敏液体的填充方式和填充液体类型对光纤温敏特性的影响。确定了最优的结构和液体填充方式,最优情况下该光纤的双折射温度灵敏度能够达到2.0507×10^(−5)/℃,在1550 nm处可获得5.96×10^(−2)的双折射。将2 mm光子晶体光纤应用于Sagnac型温度传感器中并进行传感性能仿真分析,利用多项式拟合的方法对结果数据进行拟合以分析传感器的温度灵敏度,提高拟合准确性、减小测量误差。结果表明在0~75℃范围内传感器平均灵敏度可达11.28 nm/℃,与现有典型Sagnac型温度传感器相比,本文Sagnac型温度传感器在尽量减小光纤长度的基础上获得了较高的温度灵敏度,并且测温范围更大、准确性更高。因此,该传感器在温度测量领域有一定的应用前景。Optical fiber sensors are widely valued by scholars for their simplicity of manufacture,resistance to electromagnetic interference,chemical resistance and ease of distributed measurement.Interferometric fiber optic temperature sensors use the phase change of light to achieve sensing.Sagnac interferometer based temperature sensors are widely used in the sensing field due to their high sensitivity and ease of production.The change in the phase difference can lead to a shift in the interference spectrum,which can be analyzed as a function of temperature.It is an important research direction to design special fibers in Sagnac ring to improve the sensing performance of Sagnac-type temperature sensors.The flexible structural design and air-hole fill ability of photonic crystal fibers offer the possibility to achieve excellent properties of optical fibers.In order to improve the temperature range and sensitivity of Sagnac-type temperature sensors,a photonic crystal fiber design method with high birefringence and high temperature sensitivity properties is provided.The high birefringence of the fiber facilitates the demodulation of Saganc-type temperature sensors and the high temperature sensitivity of the fiber facilitates the sensing sensitivity of Sagnac-type temperature sensors.As the optical fiber itself has limited sensitivity to temperature,it can be made to have good temperature sensitivity by filling the air holes of the fiber with temperature sensitive liquid material.The electromagnetic field model of this photonic crystal fiber is developed in COMSOL and the fiber properties are analyzed and calculated.The effect of structure parameters on the birefringence and the temperature sensitivity of the fiber is analyzed using the finite element method,and the effect of the filling method and the type of filling liquid on the temperature sensitivity of the fiber is investigated on the basis of the determined structure.The optimal structure and filling method are determined.The results show that selective filling can a

关 键 词：光子晶体光纤 Sagnac型温度传感器 双折射 温度灵敏度 乙醇填充 

分 类 号：TN253[电子电信—物理电子学]