预应力锚索用腐蚀传感器的设计  

Design of corrosion sensor for prestressed anchor cable

作　　者：江雪[1,2] 徐建丰 刘丰荣 宋天明 朱万旭[1,2,3] JIANG Xue;XU Jianfeng;LIU Fengrong;SONG Tianming;ZHU Wanxu(Guangxi Engineering Research Center of Intelligent Structural Material,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of Geotechnical Mechanics and Engineering,Guilin University of Technology,Guilin 541004,China;Guangxi HCM Technology Co Ltd,Guilin 541004,China)

机构地区：[1]桂林理工大学广西壮族自治区智慧结构材料工程研究中心,广西桂林541004 [2]桂林理工大学广西岩土力学与工程重点实验室,广西桂林541004 [3]广西汉西鸣科技有限责任公司,广西桂林541004

出　　处：《传感器与微系统》2024年第4期92-95,共4页Transducer and Microsystem Technologies

基　　金：国家自然科学基金资助项目(52068014);广西创新驱动发展专项项目(桂科AA20302006)。

摘　　要：预应力锚索的腐蚀程度与结构安全密切相关,但一直缺乏有效的监测手段。考虑到腐蚀的发生与周围环境pH变化密切相关,选用HEMA-AA水凝胶作为敏感材料并结合光纤光栅的传输优势设计传感器,识别灌浆部分受拉开裂时腐蚀介质侵入引起的pH值变化,在锚索面临腐蚀威胁时做出预警。测试结果表明:传感器的测量范围为pH值4~11,灵敏度为25 pm/pH,相关系数0.997;对比裸光纤发现将水凝胶的涂覆并没有带来光纤光栅温度特性的明显变化,灵敏度为9.5 pm/℃;试验模拟传感器在环境中持续进行监测的性能较为稳定。若考虑应用环境干湿循环的限制,则需提高水凝胶和光纤光栅结合度。通过在锚索内设置腐蚀传感器,可以达到腐蚀监测的目的。Corrosion degree of prestressed anchor cable is closely related to the structure safety,but there is no effective monitoring method.Considering that the occurrence of corrosion is closely related to the pH change of the surrounding environment.The corrosion sensor selects HEMA-AA hydrogel as the sensitive material and combines the transmission advantages of fiber Bragg grating(FBG)for design.The sensor is designed to identify the pH value change caused by the invasion of corrosive medium when the grouting part is pulled and cracked,and make an early warning when the anchor cable is facing the threat of corrosion.The test results show that the measuring range of the sensor is pH 4~11,the sensitivity is 25 pm/pH,and the correlation coefficient is 0.997;Compared with the bare fiber,it is found that the coating of hydrogel does not bring significant changes in the temperature characteristics of fiber grating,and the sensitivity is 9.5 pm/℃.The performance of the test simulation sensor for continuous monitoring in the environment is relatively stable.If the limitation of the dry and wet cycle of the application environment is considered,the combination degree of the hydrogel and the fiber grating needs to be improved.The purpose of corrosion monitoring can be achieved by setting corrosion sensors in the anchor cable.

关 键 词：锚索 腐蚀传感器 光纤光栅 水凝胶 PH值 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TN256[自动化与计算机技术—控制科学与工程]