单光栅半涂覆温湿度传感技术的研究  

Research on Single Grating Semi-Coated Temperature and Humidity Sensing Technology

作　　者：赵林[1] 冯锦来 邹泽宇 郭风军 张长峰 王金玉 王纪强 Zhao Lin;Feng Jinlai;Zou Zeyu;Guo Fengjun;Zhang Changfeng;Wang Jinyu;Wang Jiqiang(Laser Institute,Qilu University of Technology(Shandong Academy of Sciences),Jinan,Shandong 250104,China;Shandong Province Key Laboratory of Storage and Transportation Technology of Agricultural Products,Jinan,Shandong 250103,China;National Engineering Research Center for Agricultural Products Logistics,Jinan,Shandong 250103,China)

机构地区：[1]齐鲁工业大学(山东省科学院),山东省科学院激光研究所,山东济南250104 [2]山东省农产品贮运保鲜技术重点实验室,山东济南250103 [3]国家农产品现代物流工程技术研究中心,山东济南250103

出　　处：《激光与光电子学进展》2022年第7期57-63,共7页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(62005138);山东省自然基金重点项目(ZR2020KC012);齐鲁工业大学(山东省科学院)科教产融合创新试点工程项目(2020KJC-ZD04)。

摘　　要：相比传统监测手段,光纤传感器具有灵敏度高、本质绝缘性高、抗电磁干扰能力强等优势,但基于光纤布拉格光栅的湿度传感器易受温度和应力影响,存在湿度测量误差大、稳定性差等问题。针对这些问题,提出了一种单光栅半涂覆温湿度传感器的制备方法。首先,在光栅的一半栅区上涂覆湿敏材料,另外一半栅区为裸光栅。然后,对裸光栅的反射光谱峰值曲线进行高斯拟合,建立环境温度与中心波长λ的函数关系。最后,分析了光栅反射光谱曲线和峰值功率围成的面积S与不同环境湿度的关系,建立面积S与环境相对湿度的函数模型,并采用温湿度发生器对传感器进行测试。实验结果表明,在10%RH~90%RH(%RH为相对湿度)范围内,该传感器具有较好的重复性,湿度监测灵敏度为2.95/%RH,响应时间为6.6 min,满足仓储等行业对温湿度的监测需求,为相关领域的温湿度监测提供了一种新的解决方案。Optical fiber sensors have the advantages of high sensitivity,high-inherent insulation,and good antielectromagnetic interference ability compared to standard monitoring technologies.However,humidity sensors based on fiber Bragg gratings are easily affected by temperature and stress,resulting in issues such as significant humidity measurement errors and low stability.This paper proposes a fabrication method based on a single grating half-coated temperature and humidity sensor to solve these problems.First,a moisture-sensitive material is coated on half of the grating,and the other half is a bare grating area.Then,the bare grating reflection spectrum peak curve is then Gaussian fitted to establish the functional relationship between ambient temperature and center wavelength λ.Finally,the relationship between the area S enclosed by the grating reflection spectrum curve and the peak power under various environmental humidity conditions is analyzed.The function model of the area S and the relative humidity of the environment is established.The sensor is tested by a temperature and humidity generator.The experimental result shows that the sensor has good repeatability in the range of 10%-90%RH(% RH is relative humidity).The humidity monitoring sensitivity is 2.95/%RH,and the response time is 6.6 min,which matches the temperature and humidity monitoring requirements in storage and other fields while also providing a new solution for temperature and humidity monitoring in related fields.

关 键 词：光栅 温湿度 光谱曲线 高斯拟合 光谱面积 

分 类 号：O439[机械工程—光学工程]