基于双长周期光纤光栅边缘滤波的FBG冲击监测系统研究

The Study of FBG Impact Monitoring System based on a Double Edged LPFG Filter Wavelength Interrogation Technology

从长周期光纤光栅(LPFG)透射光谱和光纤布拉格光栅(FBG)解调原理角度,详细研究了LPFG透射光谱的边缘滤波特性,设计了一种基于双长周期双边缘滤波的FBG冲击监测系统方案,对该方案进行了冲击信号监测验证,采用电涡流传感系统对其进行验证.结果表明该系统对冲击信号具有较好的响应度和精确度,实验结果符合结构监测领域对冲击响应监测的需要,具有广泛的应用前景.

In respect of the transmission spectrum of LPFG and the wavelength interrogation technology for FBGs,we discussed the edged filter characteristic of a LPFG.On this basis,an impact monitoring system of FBG sensors based on a double edged LPFG filter wavelength interrogation technology was proposed.The developed system of impact signal monitoring were verified by a electro-eddy sensing system experimentally.The experimental results show fast responsivity and high accuracy that the system can be able to satisfy requirements of structure health monitoring with an extensive application prospect.