一种新型光纤光栅锈蚀传感器及其对混凝土结构钢筋锈蚀监测实验研究

设计一种新型光纤光栅锈蚀传感器，主要由锈蚀体、不锈钢体和2段串联的光纤布拉格光栅（FBG）组成。缠绕于锈蚀体表面的FBG监测钢筋的锈胀应变，缠绕于不锈钢体表面的FBG用作温度补偿器，消除温度变化对锈胀应变监测的影响。此外，设计电化学加速腐蚀实验，探究该传感器在不同强度等级混凝土中的工作性能。结果表明，该传感器监测质量腐蚀率的灵敏度为0.02%，监测范围大于1%，可实时监测混凝土中钢筋的锈蚀过程及特征，为预警钢筋锈蚀引起的钢筋混凝土结构耐久性损失提供阈值，在结构健康监测领域具有较大的应用价值。

A Novel Fiber Grating Based Corrosion Sensor and Experimental Study on Corrosion Monitoring of Reinforced Concrete Structure

In this paper, we design a novel corrosion sensor based on fiber Bragg grating (FBG). The sensor is mainly composed of a rust body, a stainless-steel body and a fiber with two FBGs connected in series. The FBG wound around the surface of the rust body monitors the corrosion strain of the steel bar, and the FBG wound around the surface of the stainless-steel body acts as a temperature compensator to eliminate the influence of temperature changes on the swell strain monitoring. To investigate the performance of the proposed corrosion sensor, an electrochemically accelerated corrosion experiment is carried out on concrete specimens of different strength grades. The experimental results show that the sensor sensitivity of the quality corrosion rate is 0.02%, and the monitoring range is over 1%. It can be demonstrated that the proposed sensor can monitor in real time the corrosion process and detect the characteristics of steel bars in concrete. The monitoring data can be employed to indicate durability loss due to steel corrosion in reinforced concrete structures. Therefore, the proposed corrosion sensor has a wide application prospect in the field of structural health monitoring.