摘要
为了提高温度传感器的灵敏度,本文提出了基于纳米材料封装的干涉型微纳光纤温度传感器.该传感器通过熔融拉锥光敏光纤得到微纳光纤,用毛细管封装后填充高热光系数氮化硼分散液,并用紫外胶封装防止氮化硼挥发.当微纳光纤直径越小时,倏逝场越强,与外界环境的相互作用也会增强,但在灵敏度与稳定性之间平衡折中,实验中选择直径为12.3μm的微纳光纤.氮化硼分散液随温度变化折射率变化大,即对温度变化更敏感,通过传输光谱的漂移来检测温度响应.实验结果表明,随着温度的升高,透射光谱向波长更短的方向移动.无纳米材料封装的温度传感器灵敏度为-0.0297 nm/℃,氮化硼分散液封装之后灵敏度最高可达-0.2878 nm/℃,大约为无纳米材料封装传感器灵敏度的十倍左右.氮化硼分散液的浓度对实验温度灵敏度的影响十分微弱.该传感器具有结构小巧轻便,成本低,机械性高等优势,而且纳米材料封装可保护微纳光纤免受环境变化造成的形变以及外界杂质对传感部分的污染,保证实验的准确性.该传感器在温度传感领域具有重大发展潜力.
In order to improve the sensitivity of the temperature sensor,this sensor based on a microfiber interference and nanomaterial(boron nitride(BN)dispersion)encapsulation has been proposed in this study.The microfiber interference has a simple fabrication process,which was manufactured by using a butane flame brushing for tapering a commercial multimode fiber to micron scale.The smaller the diameter of the microfiber is,the stronger the evanescent field is.The interaction between the evanescent potential field and the external environment was enhanced.It was a trade-off between sensitivity and stability of microfiber interference,with the selected diameter of 12.3μm in the experiments.This microfiber interference was encapsulated in a capillary tube including BN dispersion with high thermo-optical coefficient to form this senor.In order to prevent liquid leakage,both ends of the capillary tube were sealed with the ultraviolet(UV)glues.The microfiber interference spectrum was stable after sealing with UV glue.The refractive index of the BN dispersion was more sensitive to temperature changes,which results in wavelength shift of microfiber interference.Therefore,the temperature response of this senor encapsulated with BN is measured by observing the drift of the transmission spectrum.The results show that the blueshifts of the wavelength occurs with the temperature increases,and the sensitivity of the temperature sensor encapsulated with BN can up to-0.2878 nm/℃,which is more than 10 times higher than without BN encapsulation(the sensitivity of-0.0297 nm/℃).The concentration of BN dispersion has little effect on the temperature sensitivity.The sensor has the advantages of small structure,light weight,low cost,and high mechanical properties.Moreover,the encapsulation can protect the microfiber interference from sensing deformation caused by environmental changes and contamination of the sensing part by external impurities,which can improve the accuracy of the experiment.This sensor has great application potential in the field of temperature sensing.
作者
孙丹丹
杨润
SUN Dan-dan;YANG Run(School of Physics and Electronic Engineering,Shanxi University,Taiyuan 030006 China)
出处
《量子光学学报》
北大核心
2021年第3期227-234,共8页
Journal of Quantum Optics
基金
国家自然科学基金青年基金(62005147)
山西省高等学校科技创新项目(2019L0084)
研究生教育改革研究课题项目。
关键词
纳米材料封装
模式干涉
微纳光纤
温度传感器
nanomaterial encapsulation
mode interferometer
optical microfiber
temperature sensor
