基于涂覆石墨烯量子点-聚乙烯醇的拉锥细芯光纤的温湿度传感器  

Temperature and Humidity Sensor Based on Tapered Thin-Core Fiber Coated with Graphene Quantum Dots-Polyvinyl Alcohol

作　　者：鲁志琪 董锐敏 刘昌宁 Lu Zhiqi;Dong Ruimin;Liu Changning(College of Physics and Electronic Science,Hubei Normal University,Huangshi 435002,Hubei,China)

机构地区：[1]湖北师范大学物理与电子科学学院,湖北黄石435002

出　　处：《中国激光》2023年第1期238-245,共8页Chinese Journal of Lasers

基　　金：湖北省高等学校优秀中青年科技创新团队计划项目(T2020014,T2021010);湖北师范大学省级大学生创新创业训练计划项目(S202210513051)。

摘　　要：提出了一种基于拉锥细芯光纤的温湿度传感器。先将细芯光纤熔接在两段多模光纤的中间,并在多模光纤两端熔接单模光纤,利用拉锥机对细芯光纤进行分步拉锥。实验测得细芯光纤拉锥前后的传感器的温度灵敏度分别为31 pm/℃和72.7 pm/℃。将少量石墨烯量子点-聚乙烯醇涂覆在传感器锥部得到温湿度传感器,实验测得其温度灵敏度最大为288.3 pm/℃,湿度灵敏度可达到131.7 pm/%。该传感器具有性能稳定、灵敏度高、制备简单、成本低的特点,在温度和湿度传感领域具有广阔的应用前景。Objective Temperature and relative humidity sensors play an important role in various processes.Compared with traditional sensors,optical fiber sensors have the advantages of simple structure,strong corrosion resistance,and strong anti-electromagnetic interference capability.Functional sensors reduce manufacturing difficulty and cost compared to nonfunctional sensors because they do not require other sensitive components.Among them,interferometric sensors have become a topic of interest in recent years because of their simple manufacturing process and low cost.In particular,the Mach-Zehnder interferometer(MZI)plays an indispensable role in the measurement of basic physical quantities,such as temperature,relative humidity,refractive index,and stress.However,indicators such as the sensitivity and stability of MZI sensors need to be improved.To further improve the sensitivity and stability of such sensors,we propose and demonstrate a temperature and relative humidity sensor based on a tapered thin-core fiber coated with a graphene quantum dots-polyvinyl alcohol(GQDs-PVA)solution.The sensor consists of a 2 cm segment of tapered thin-core fiber and two 2 mm multi-mode fibers.The two multimode fibers are located between two single-mode fibers,in which the thin-core fiber constitutes the sensor cone after distributed taper processing.When the external temperature,relative humidity,and other physical quantities vary,the effective refractive index difference between the cladding and core layers changes,resulting in the movement of the central wavelength of the spectral line,which can be monitored in real time on the spectrometer.Therefore,this optical fiber sensor can monitor changes in these external physical quantities.The proposed sensor exhibits higher temperature sensitivity after coating with the GQDs-PVA solution than traditional sensors.In addition,owing to the unique properties of PVA,the sensor exhibits high sensitivity to relative humidity.Compared to other sensors intended to measure these quantities,this sens

关 键 词：传感器 细芯光纤 石墨烯量子点 聚乙烯醇 温度 相对湿度 

分 类 号：TN253[电子电信—物理电子学]