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中文摘要：
混凝土中钢筋发生锈蚀会严重影响混凝土结构的使用功能,文章提出了通过观察长周期光纤光栅（LPFG）的透射谱变化对混凝土结构中的钢筋锈蚀进行监测。这种方法基于长周期光纤光栅的微弯特性,利用其透射光谱随弯曲度增加逐渐变浅、谐振波长处的光功率与LPFG的弯曲度成线性这一特性,将钢筋锈蚀引起的钢筋径向膨胀转化为光栅的弯曲,通过监测光栅的光谱变化获知光栅的弯曲度进而判断钢筋的锈蚀程度,该方法对钢筋直接进行监测,简单易行,并利用光栅的光谱特性从而避免了环境温度、应变、折射率的影响,实验将光栅埋入到混凝土构件中,从已取得的实验结果来看,这种方法测量钢筋锈蚀厚度的准确度可达1.2μm,可监测到的锈蚀厚度达3 mm,完全能够实现混凝土结构中钢筋锈蚀的早期至中期监测。
英文摘要：
The consideration on the durability of concrete structures with reinforcement corrosion has become a most urgent problem.A new technique to measure the corrosion of steel in concrete structures was proposed in the present paper.It is based on the microbending characteristic of long period optical grating（LPFG）.The temperature spectum character and curvature spectrum character of long period optical fiber grating were studied first.It was shown that the transmission spectrum of long period optical fiber grating shifted right and the transmission of the resonance wavelength was invariable when the temperature increased,while the transmission spectrum of long period optical fiber grating became shallow when the curvature increased,the transmission of the resonance wavelength would increase and it was linear with the curvature.On the basis of the characteristic,a notch shaped pedestal was designed and a long period optical fiber grating was laid on the steel surface.With this method the radial expansion of the steel resulting from the steel corrosion would translate into the curvature of the long period optical fiber grating.The curvature of long period optical fiber grating could be obtained by analyzing the change of spectrum,and then the steel corrosion depth could be measured.This method is simple and immediate and is independent of the variety in temperature,strain and refractive index owing to the inimitable spectrum characteristic of long period optical fiber grating.From the experiment it was found that the precision of the corrosion depth was better than 1.2 μm,and the corrosion depth of 3 mm could be achieved.This measurement could be used to monitor the early to metaphase corrosion of reinforcing steel in concrete structures.
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