基于聚酰亚胺涂覆的FBG盐度传感器
FBG Salinity Sensor Based on Polyimide Coating
DOI: 10.12677/AAC.2023.134050, PDF,   
作者: 邹 帅, 张建新：浙江理工大学机械工程学院，浙江 杭州；张轶恒：浙江理工大学信息科学与工程学院，浙江 杭州
关键词: 光纤布拉格光栅；盐度传感器；聚酰亚胺；化学蚀刻；片状PI薄膜；Fiber Bragg Grating； Salinity Sensor； Polyimide； Chemical Etching； Lamellar PI Film
摘要: 为检测海水盐度变化，针对目前测量仪器存在灵敏度低、易受电磁干扰、难以远距离监测等问题，提出了一种基于聚酰亚胺(PI)涂覆光纤布拉格光栅(Fiber Bragg Grating, FBG)的盐度传感器。该传感器由两个FBG (FBG1和FBG2)级联构成。其中，通过化学蚀刻减小FBG1直径，再涂覆一层片状PI薄膜制成盐度传感元件；FBG2为未处理的裸光栅，用作温度补偿。传感器的温度和盐度传感实验结果表明：FBG1对温度和盐度都敏感，其盐度和温度灵敏度分别为−54.6 pm/%和32.2 pm/℃；FBG2对盐度不敏感，其温度灵敏度为10.1 pm/℃。基于FBG1和FBG2的盐度和温度灵敏度，构建传感矩阵，解决了FBG1对温度和盐度交叉敏感问题。该传感器具有制作简单、灵敏度高与稳定性好等优点。
Abstract: To address the issues of low sensitivity, susceptibility to electromagnetic interference, and difficulty in long-distance monitoring associated with current measurement instruments for detecting sea-water salinity changes, a salinity sensor based on polyimide (PI) coated Fiber Bragg Grating (FBG) has been proposed. The sensor consists of two FBGs (FBG1 and FBG2) cascaded together. Among them, reducing the diameter of FBG1 through chemical etching, and then coating a layer of sheet-like PI film to make a salinity sensing element; FBG2 is an unprocessed bare grating used for temperature compensation. The temperature and salinity sensing experimental results of the sen-sor indicate that FBG1 is sensitive to both temperature and salinity, with salinity and temperature sensitivities of −54.6 pm/% and 32.2 pm/˚C, respectively; FBG2 is not sensitive to salinity, and its temperature sensitivity is 10.1 pm/˚C. Based on the salinity and temperature sensitivity of FBG1 and FBG2, a sensing matrix was constructed to solve the cross-sensitive problem of FBG1 to tem-perature and salinity. This sensor has the advantages of simple fabrication, high sensitivity, and good stability.
文章引用：邹帅, 张建新, 张轶恒. 基于聚酰亚胺涂覆的FBG盐度传感器[J]. 分析化学进展, 2023, 13(4): 457-465. https://doi.org/10.12677/AAC.2023.134050

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