填充甲苯的高温度灵敏度双芯光子晶体光纤  

High temperature sensitivity elliptical two-core photonic crystal fiber filled with toluene

作　　者：余明芯 吕欢祝 张克非[2] 秦亮 YU Mingxin;LV Huanzhu;ZHANG Kefei;QING Liang(School of Science,Southwest University of Science and Technology,Mianyang 621010,China;School of Computer Science and Technology,Southwest University of Science and Technology,Mianyang 621010,China)

机构地区：[1]西南科技大学理学院,绵阳621010 [2]西南科技大学计算机科学与技术学院,绵阳621010

出　　处：《激光杂志》2020年第5期35-39,共5页Laser Journal

基　　金：四川省科技厅重点研发项目(No.18zs211201);国家级大学生创新训练项目(No.201910619031)。

摘　　要：为进一步提高光纤温度传感器的灵敏度,同时抑制偏振态漂移、模间干扰,提出一种新型双芯光子晶体光纤(PCF)温度传感结构。采用COMSOL建立温度传感模型,在其近芯区的椭圆孔内填入甲苯,利用全矢量有限元法(FEM)研究不同结构参数和填充液体对温敏特性的影响,通过分析双折射变化规律得到最优参数选择方案。基于萨格纳克干涉传感原理,对最终所得光子晶体光纤的温敏特性进行仿真验证,获得温度与透射谱的对应关系。结果表明,该光子晶体光纤的灵敏度约为9.56 nm/℃,光纤长度小于传统光纤传感单元,温度传感区间为-90℃~105℃,适于低温与常温范围内的高灵敏度温度传感。In order to further improve the sensitivity of fiber optic temperature sensor,and simultaneously suppress the polarization drift and inter-mode interference,a new dual-core photonic crystal fiber(PCF)temperature sensing structure is proposed.Using COMSOL to establish a temperature sensing model,filling the elliptical hole near the core area with toluene,using the full vector finite element method(FEM)to study the effects of different structural parameters and filling liquid on temperature-sensitive characteristics,by analyzing the law of birefringence to get the optimal parameter selection scheme.Based on the principle of Sagnac interference sensing,the temperature-sensitive characteristics of the photonic crystal fiber finally obtained are simulated and verified,and the corresponding relationship between temperature and transmission spectrum is obtained.The results show that the sensitivity of photonic crystal fiber is about 9.56 nm/℃,the fiber length is shorter than traditional fiber sensing unit,and the temperature sensing interval is -90℃~105℃,which is suitable for high sensitivity temperature sensing in low temperature and normal temperature range.

关 键 词：光纤光学 高灵敏温度传感 全矢量有限元法 双芯光子晶体光纤 热光系数 

分 类 号：TN253[电子电信—物理电子学]