基于聚合物薄膜的光纤Bragg光栅甲醇传感器  

Fiber Bragg Grating Methanol Sensor Based on Polymer Film

作　　者：贺超 刘志成 姚建南 武惠华 钟年丙[1] 曾檀 唐欢 解泉华[1] HE Chao;LIU Zhicheng;YAO Jiannan;WU Huihua;ZHONG Nianbing;ZENG Tan;TANG Huan;XIE Quanhua(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;Liangjiang International College,Chongqing University of Technology,Chongqing 401135,China;Key Scientific Research Base of Pest and Mold Control of Heritage Collection(Chongqing China Three Gor ges Museum),National Cultural Heritage Administration,Chongqing 400013,China)

机构地区：[1]重庆理工大学光纤传感与光电检测重庆市重点实验室智能光纤感知技术重庆市高校工程研究中心,重庆400054 [2]重庆理工大学两江国际学院,重庆401135 [3]重庆中国三峡博物馆馆藏文物有害生物控制研究国家文物局重点科研基地,重庆400013

出　　处：《压电与声光》2023年第3期439-444,449,共7页Piezoelectrics & Acoustooptics

基　　金：重庆市教委科学技术研究计划重大基金资助项目(KJZD-M202201101);国家自然科学基金面上基金资助项目(52176178、51876018);重庆市技术创新与应用发展专项基金资助项目(cstc2020jscx-msxmX0097);重庆理工大学研究生创新基金资助项目(gzlcx20222031)。

摘　　要：为了稳定准确地检测甲醇蒸汽浓度,该文提出了一种基于聚甲基丙烯酸甲酯(PMMA)薄膜的光纤Bragg光栅(FBG)甲醇传感器。首先使用氢氟酸腐蚀部分包层,在栅区表面涂覆一层PMMA薄膜;然后构建测量系统,建立了传感器检测甲醇蒸汽的理论模型;最后引入温度补偿单元,消除温度对甲醇蒸汽浓度测量产生的影响。实验研究了PMMA薄膜厚度和温湿度对传感器灵敏度的影响,测试了传感器的响应时间、选择敏感性和检测下限。研究结果表明,在甲醇质量浓度为20~160 mg/L时,传感器的中心波长漂移与浓度间具有线性关系(线性系数R2=0.992)。在温度20~40℃,相对湿度40%~80%时,传感器能够准确检测甲醇蒸汽浓度的变化,其灵敏度为0.292 pm/(mg·L^(-1)),相对误差为9.3%,检测下限为20 mg/L。In order to achieve stable and accurate detection of methanol vapor concentration,a fiber Bragg grating(FBG)methanol sensor based on polymethyl methacrylate(PMMA)film was proposed.First,use hydrofluoric acid to etch part of the cladding layer,and coat a layer of PMMA film on the surface of the gate region.Then,a measurement system was constructed,and a theoretical model for the sensor to detect methanol vapor was established.Finally,a temperature compensation unit is introduced to eliminate the effect of temperature on the measurement of methanol vapor concentration.The effects of PMMA film thickness and temperature and humidity on the sensitivity of the sensor were experimentally studied,and the response time,selection sensitivity and detection limit of the sensor were tested.The results show that there is a linear relationship(R 2=0.992)between the center wavelength drift of the sensor and the concentration in the methanol concentration range of 20-160 mg/L.In the temperature range of 20-40℃and relative humidity of 40%-80%,the sensor can accurately detect the change of methanol vapor concentration with a sensitivity of 0.292 pm/(mg·L^(-1)),a relative error of 9.3%,and a lower detection limit of 20 mg/L.

关 键 词：甲醇 聚甲基丙烯酸甲酯 光纤Bragg光栅(FBG) 温度补偿 灵敏度 检测 

分 类 号：TN384[电子电信—物理电子学]