用于PEMFC的FBG湿度传感器的制作及性能研究  

Fabrication and performance study of FBG humidity sensor for PEMFC

作　　者：张城 陈涛[1] 刘士华[1] 刘康杰 ZHANG Cheng;CHEN Tao;LIU Shi-hua;LIU Kang-jie(School of Mechanical and Electronic Engineering,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学机电工程学院,湖北武汉430070

出　　处：《光电子．激光》2020年第10期1025-1035,共11页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(51975445)资助项目。

摘　　要：研究了以聚酰亚胺为湿敏材料的光纤Bragg光栅(FBG)湿度传感器并用其对质子交换膜燃料电池(PEMFC)停机过程中内部湿度进行了实时监测。传感器利用聚酰亚胺的湿膨胀效应,实现了对24.7%-98%RH范围内相对湿度的监测。采用腐蚀光纤包层的方法减小光纤包层直径,实验结果表明,该方法能在不影响FBG相对湿度传感器灵敏度的情况下,提高对外界环境相对湿度变化的响应速度。所研制的FBG相对湿度传感器灵敏度能达到3.8 pm/RH,线性度达到99.85%,最大回程误差不超过9 pm,当环境相对湿度从50%突变到85%时,经过腐蚀处理后的FBG相对湿度响应时间仅为15.4 s。将该FBG湿度传感器布置于PEMFC内部进行停机过程中湿度的实时监测,实验结果表明,所制作的FBG湿度传感器能够准确地反映PEMFC停机吹扫过程中内部湿度的变化。The fiber Bragg grating(FBG) humidity sensor using polyimide as the moisture sensitive material was studied and used to monitor the internal humidity in real time during the shutdown of the proton exchange membrane fuel cell(PEMFC).The sensor utilizes the effect of wet expansion of polyimide to make the axial pitch of FBG change with the change of external humidity.The method of corroding the optical fiber cladding is used to reduce the diameter of the optical fiber cladding.The experimental results show that this method can increase the change of the relative humidity of the external environment without affecting the sensitivity of the FBG relative humidity sensor.Speed of response.The developed FBG relative humidity sensor has a sensitivity of 3.8 pm/RH,a linearity of 99.85%,and a maximum return error of no more than 9 pm.When the environmental relative humidity changes from 50% to 85%,it is corroded the relative FBG relative humidity response time is only 15.4 s.The FBG humidity sensor is placed inside the PEMFC for real-time monitoring of humidity during shutdown.The experimental results show that the FBG humidity sensor produced can accurately reflect the changes in internal humidity during the shutdown and purge of the PEMFC.

关 键 词：光纤Bragg光栅(FBG) 质子交换膜燃料电池(PEMFC) 湿度传感器 灵敏度 响应时间 

分 类 号：TN253[电子电信—物理电子学]