单端反射镀膜长周期光栅的钢筋锈蚀传感机理及方法研究

项目名称： 单端反射镀膜长周期光栅的钢筋锈蚀传感机理及方法研究

项目编号： No.51309001

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 水利工程

项目作者： 王彦

作者单位： 安徽工业大学

项目金额： 25万元

中文摘要： 在土木工程领域，钢筋锈蚀是导致混凝土结构耐久性劣化的主要原因，而氯离子侵蚀又是引起钢筋锈蚀的因素之一。实时在线监测钢筋周围氯离子浓度的变化，对发现钢筋的早期锈蚀有重要意义。本项目利用长周期光栅对折射率的敏感性，基于光栅耦合模理论，综合利用表面等离子体共振（SPR）效应及迈克尔逊干涉效应对外界折射率高灵敏响应的优势，构建新型的单端反射镀膜结构长周期光栅（SCLPG），建立能够准确反映SPR激励过程和自干涉效应的SCLPG理论模型。通过仿真分析建立其传感机理模型，设计氯离子浓度传感器结构构造，仿真传感器在混凝土中的工作过程，优化传感器的设计参数；通过理论分析和钢筋快速锈蚀试验，建立SCLPG传感器响应与混凝土内部钢筋周围氯离子浓度之间的定量关系。本项目着眼于早期锈蚀时钢筋周围的氯离子浓度监测，研究成果将为基于光纤光栅的钢筋锈蚀智能监测提供新思路，并为SCLPG新型传感器的实用化提供理论指导。

中文关键词： 钢筋锈蚀；长周期光纤光栅；单端反射；锈蚀传感器；镀膜

英文摘要： In the field of civil engineering, the steel corrosion is one of the reasons why concrete structure durability degraded, and the chloride ion erosion is an important factor which cause the steel corrosion. Real-time and on-line monitoring chloride ion concentration around the reinforcing bar has important significance to find the early reinforcement corrosion. The sensitivity of the refractive index of long period fiber grating is used in this project, based on the coupled-mode theory, comprehensive utilization the surface plasmon resonance (SPR) effect and Michelson interference effect, which have high sensitive response to environment index, establishing a new single end reflection coating structure long period grating (SCLPG), monitoring concentrations of chloride ion concentration around steel in concrete. Establish the sensing mechanism model through the simulation analysis, design chloride ion concentration sensor structure, simulate the sensor working process in the concrete, and optimize the design parameters of the sensor. Through the simulation analysis and reinforcement accelerated corrosion test, the quantitative relationship between the SCLPG sensor response and internal chloride ion concentration around reinforcement concrete is established. The project focuses on LPG theory model which can accurat

英文关键词： steel corrosion；long period fiber grating；single end reflection；corrosion sensor；sensitve film