光纤光栅锈蚀传感器在不同湿度下的特性研究  

A Fiber Bragg Grating Sensor of Steel Corrosion at Different Humidities

作　　者：蔡汉莉[1] 胡文彬[1] 张艳晓[1] 丁莉芸[1] 陈伟[2] 

机构地区：[1]武汉理工大学纤传感技术国家工程实验室,武汉430070 [2]武汉理工大学材料科学与工程学院,武汉430070

出　　处：《光子学报》2011年第5期690-693,共4页Acta Photonica Sinica

基　　金：国家自然科学基金(No.50802069,No.50802067)资助

摘　　要：钢结构的锈蚀监测对于钢结构安全的早期预警非常重要.本文提出了一种制备布喇格光纤光栅锈蚀传感器的方法,并研究了该传感器在不同湿度环境下的传感规律.结合磁控溅射和电镀的方法在光栅侧表面制备了Fe-C合金传感膜;利用扫描电子显微镜观察其侧表面形貌;检测在相对湿度60%和99%下中心波长的变化,进而分析该光纤光栅探头在不同湿度下的传感规律.实验和数据分析结果表明:在相对湿度为60%时,锈蚀进程缓慢,随着时间的推移波长呈线性化增加;相对湿度达到99%时光栅光谱出现多峰现象.据此得出:一定湿度条件下,该传感器可监测锈蚀进展;当环境湿度较高(达到99%)时,该传感器可用于锈蚀出现的早期预警.A prototype Fiber Bragg Gratings（FBG） sensor for monitoring corrosion of steel structures was presented and the performances were characterized at different humidities.The sensor was fabricated by sputtering and electroplating a sensitive metal film on FBG side-face.The surface micro-structures of sensor at different humidities were investigated by Scanning Electron Microscope during a 27-day experimental cycle.The shifting of wavelength was recorded by Optical Spectrometer Analyzer in two environments with humidity of 60% and 99% RH.The wavelength of FBG sensor at 60%RH increased linearly with an increment of 0.025 nm per day.For sensors at 99%RH,the chirping appears,which implies more serious corrosion occurs than that at 60% RH.The experimental results show that the proposed FBG corrosion sensor is applicable for corrosion monitoring at a humidity of lower than 60%RH,and applicable for early alert of corrosion at a higher humidity.

关 键 词：光纤光栅 锈蚀传感器 湿度条件 波长调制 

分 类 号：TN253[电子电信—物理电子学]