【摘要】 提出了一种新型测量钢筋锈蚀的光栅传感器,即双筋腐蚀光栅传感器。这种传感器将光纤布拉格光栅粘贴固定于两根紧密排列的钢筋上表面。当钢筋锈蚀后,体积膨胀而使光纤光栅产生拉伸应变,光纤光栅的反射光波长将发生变化,所以通过测量光纤光栅的波长就可以测得钢筋锈蚀程度。这种传感器利用光纤光栅波长位移来监测钢筋锈蚀,能够间接反映钢筋锈蚀程度,且不受锈蚀因素的影响,可用于混凝土结构中钢筋锈蚀的早期监测。更多还原

【Abstract】 A new type of optical fiber grating sensor for monitoring corrosion of reinforcement steel was presented optical fiber grating corrosion sensor with two steel bars.In the sensor,Bragg grating is stick on the top surface of two bars against each other,for which the principle is that the steel volume will be expanded due to corrosion.The monitoring will be carried out by transforming the volume increase to the fiber strain.While Bragg gratings is tensioned,the reflected spectrum will have a single distinct peak shift in center wavelength, as a result the loss and rate of steel corrosion can be obtained.By the designed sensor,corrosion is recorded with the shift in center wavelength through the fiber,and the degree of corrosion of reinforcement steel will be measured indirectly,which is not affected by corrosion factors.Therefore the sensor proposed in the paper could be used in the early corrosion monitoring of reinforcement steel in concrete structures.更多还原