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研究了长周期光纤光栅(LPFG)谐振透射光谱对外界环境折射率变化的敏感特性,在此基础上提出了将混凝土内部钢筋周围环境折射率与LPFG光谱特性相结合的理论,设计了一种基于折射率测量的LPFG钢筋锈蚀监测传感器。采用LPFG透射光谱检测技术,获取钢筋锈蚀过程中混凝土内部不同折射率环境所对应的LPFG透射光谱曲线族,进而得到LPFG谐振峰波长与混凝土内部钢筋锈蚀程度之间的对应关系,其谐振峰波长随钢筋锈蚀量的增加而先向短波后向长波方向偏移。该方法对混凝土内部钢筋锈蚀状态进行直接监测,测量及传导光路实现全光纤化,无需化学试剂标记,可实现对钢筋锈蚀过程的在线、精确及远距离遥测。
In this paper, the sensitive characteristics of the resonant transmission spectrum of long-period fiber grating (LPFG) to the change of refractive index of the external environment are studied. Based on this, the theory of combining the refractive index around the reinforcing steel bar inside the concrete with the spectral characteristics of LPFG is proposed. Refractive Index Measurement of LPFG Reinforcement Corrosion Monitoring Sensor. LPFG transmission spectroscopy was used to obtain the LPFG spectral curve family corresponding to the different refractive index environments in the concrete during corroded steel bar, and the corresponding relationship between the resonance wavelength of LPFG and the corrosion degree of rebar in the concrete was obtained. The resonant peak wavelength The amount of steel corrosion increased first and then shifted to shortwave longwave direction. The method directly monitors the corroded state of rebar in the concrete, and realizes all-fiber-optic measurement and transmission light path without chemical reagent mark, thus realizing on-line, precise and long-distance telemetry to the steel corroded process.