基于混合等离子体波导布拉格光栅的温湿度传感器  

Temperature and Humidity Sensor Based on Hybrid Plasmonic Waveguide Bragg Grating

作　　者：胡光熹 曾佳雨 罗海梅 HU Guang-xi;ZENG Jia-yu;LUO Hai-mei(Key Laboratory of Optoelectronics and Telecommunication of Jiangxi Province,Jiangxi Normal University,Nanchang 330022,China)

机构地区：[1]先进电子材料与器件江西省重点实验室,江西南昌330022

出　　处：《光学与光电技术》2024年第6期59-67,共9页Optics & Optoelectronic Technology

基　　金：国家自然科学基金(11804133);江西省主要学科学术和技术带头人培养项目(20232BCJ22012);江西省教育厅科学技术研究重点项目(GJJ2200306)资助。

摘　　要：光纤温湿度传感器因其易集成、抗电磁干扰及耐腐蚀等特性,在医疗、生物等领域得到广泛应用。聚乙烯醇(Polyvinyl Alcohol,PVA)材料因其独特性质常用于湿度传感。为此,设计了一种结合聚乙烯醇的温湿度敏感特性与表面等离子体共振原理(Surface Plasma Resonance,SPR)并实现高灵敏度的光纤混合等离子体波导温湿度传感器,并进行了仿真验证。该传感器是由PVA光纤两端搭连微纳米光纤制成的,并在PVA光纤下方放置金属光栅衬底,通过表面等离子效应来增强其传感灵敏度。研究发现,在20%~90%RH范围内,传感器的灵敏度为-1.750 31 nm/%RH;在20~90℃温度范围内,其温度灵敏度为-0.518 93nm/℃。结果表明,波长偏移与外部参数(温度和湿度)之间有良好的线性关系。Optical fiber sensors for humidity and temperature measurement are extensively utilized in medical and biological applications due to their ease of integration,immunity to electromagnetic interference,and resistance to corrosion.Polyvinyl alcohol(PVA)is frequently employed as a sensing material for humidity owing to its distinctive properties.Consequently,we designed and simulated a high-sensitivity optical fiber hybrid plasmonic waveguide sensor that integrates the humidity sensitivity of PVA with the principles of surface plasmon resonance(SPR).This sensor comprises PVA optical fibers connected at both ends to micro-nanofibers,with a metallic grating substrate positioned beneath the PVA optical fiber to enhance sensing sensitivity via surface plasmon effects.The experimental results indicate that the sensor exhibits a sensitivity of-1.7491 nm/%RH within the 20% to 90% relative humidity range,while its temperature sensitivity is measured at-0.51893 nm/℃ across temperatures from 20℃ to 90℃.It demonstrates a strong linear correlation between wavelength shifts and external parameters such as temperature and humidity.

关 键 词：光纤传感 温湿度传感 布拉格光栅 表面等离子共振 聚乙烯醇 

分 类 号：TN253[电子电信—物理电子学]