壳聚糖/聚乙烯醇/纳米碳粉复合物涂覆光纤布拉格光栅湿度传感器  

Chitosan/Polyvinyl Alcohol/Nanocarbon Powder Composite Coated Fiber Bragg Grating Humidity Sensor

作　　者：陈鹏宇 钟年丙[1] 何雪丰 解泉华 万波 贺媛媛 吴磊 刘洋[1] 赖东 Chen Pengyu;Zhong Nianbing;He Xuefeng;Xie Quanhua;Wan Bo;He Yuanyuan;Wu Lei;Liu Yang;Lai Dong(Chongqing Key Laboratory of Optical Fiber Sensor and Photoelectric Detection,Chongqing Engineering Research Center of Intelligent Optical Fiber Sensing Technology,Chongqing University of Technology,Chongqing 400054,China;Meishan San Su Shrine Museum,Meishan 620010,Sichuan,China;Chongqing Natural History Museum,Chongqing 400711,China)

机构地区：[1]重庆理工大学智能光纤感知技术重庆市高校工程研究中心重庆市光纤传感与光电检测重点实验室,重庆400054 [2]眉山三苏祠博物馆,四川眉山620010 [3]重庆自然博物馆,重庆400711

出　　处：《光学学报》2024年第4期336-345,共10页Acta Optica Sinica

基　　金：眉山市科技计划重点项目(2022ZYZF13);国家自然科学基金面上项目(52176178);重庆市自然科学基金创新发展联合基金(市教委)重点项目(CSTB2022NSCQ-LZX0059);重庆市教委重大科技研究项目(KJZD-M202201101);重庆市人才项目(CSTC0222YCJH-bgzxm0241);重庆市高校创新研究群体项目(CXQT21035);四川省科技计划重点研发项目(2023YFS0455);重庆理工大学研究生创新项目(gzlcx20233158)。

摘　　要：为了实现相对湿度高灵敏、快速、准确的检测,本文提出了一种基于壳聚糖/聚乙烯醇/纳米碳粉复合物涂敷的光纤布拉格光栅湿度传感器。建立了传感器检测相对湿度的理论模型。实验研究了湿度敏感(简称湿敏)膜成分与厚度、温度及光辐射对传感器性能的影响。研究表明,当壳聚糖与聚乙烯醇中纳米碳粉掺杂的质量分数为10%、湿敏膜厚度为185μm时,相对湿度在20%RH~90%RH(相对湿度单位)范围内传感器灵敏度达到57.7 pm/(%RH),响应时间为420 s,恢复时间为540 s。将传感器封装在黑色聚四氟乙烯毛细管内,且通过引入温度补偿光纤布拉格光栅(FBG-T)的方法对温度进行解耦后,在温度为5~65℃、光辐射波长为220~1200 nm、光辐射强度为50 mW/cm^(2)时,传感器测量结果可免疫温度和光辐射的影响,测量结果准确性高、重复性好,且最大相对误差小于5.8%。Objective Humidity is an important factor affecting industrial production,crop planting,food processing,microbial culture,human health,and cultural relics preservation because it is easy for bacteria,fungi,and viruses to grow and reproduce under appropriate humidity.Especially in the high humidity environment,the surface of organic cultural relics(such as leather,bamboo,paper,and textiles)is prone to breed mold.However,in a dry(low humidity)environment,it is subject to cause dry cracking of cultural relics,and even result in oxidation and deterioration of cultural relics.Therefore,accurate in-situ real-time detection of environmental humidity of cultural relics preservation is vital for effective preventive protection of cultural relics.At present,the main sensors adopted for on-line humidity detection are electrochemical humidity sensor,surface acoustic wave humidity sensor,and fiber optic humidity sensor.Optical fiber sensors feature small size,high temperature resistance,corrosion resistance,electromagnetic interference resistance,and quasi-distributed measurement,and have become one of the most promising sensors for online relative humidity detection.However,it still faces the problems of low sensitivity,long response time,and low accuracy.Therefore,it is necessary to develop a fiber optic humidity sensor with high sensitivity,short response time,and high accuracy.Methods To improve the performance of fiber Bragg grating(FBG)humidity sensors,firstly,we construct a new humidity-sensitive material composed of chitosan,polyvinyl alcohol,and nanocarbon powder.Secondly,the FBG humidity sensor is made.Thirdly,the principle of humidity detection by sensor is analyzed.Fourthly,the humidity measurement system is set up.Fifthly,the surface morphology and composition of the samples are characterized by scanning electron microscopy(SEM)and Fourier transform infrared(FT-IR)spectroscopy.Additionally,the influence of the preparation conditions and the environment on the sensor performance is studied experimentally,and the o

关 键 词：光纤布拉格光栅 湿度传感器 灵敏度 响应时间 准确度 

分 类 号：TN253[电子电信—物理电子学]