Demodulation technique of fiber grating vibration sensor based on the edge filter method
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摘要: 为了满足各种场合中对振动信号监测的需求,基于长周期光栅的边缘滤波原理,设计了一种结构简单、低成本的光纤布喇格光栅振动传感器解调系统。系统在硬件部分采用双光路结构及低噪声光电转换电路,解调及显示软件基于LabVIEW平台开发。通过在可调谐振动台上试验,证明了系统能实现对振动传感器可用范围(0Hz~300Hz)内振动信号频率的解调,误差在3%以内。结果表明,振动加速度与模拟信号伏值成线性关系,拟合得到本系统的比例因子为0.94,拟合程度为0.9752,可对加速度在0~4.7g范围内的振动信号进行振动加速度解调。Abstract: In order to meet the needs of vibration signal monitoring on various occasions, based on long-period grating edge filtering principle, a fiber Bragg grating vibration sensor demodulation system with simple structure and low cost was designed. Dual optical path structure and low noise photoelectric conversion circuit were used in the hardware part. Demodulation system and display software were based on LabVIEW platform. After the testing on a tunable vibration bench, the demodulation of vibration signal frequency was obtained in the available range (0Hz~300Hz)of vibration sensors. The error was less than 3%. The results show that vibration acceleration analog signal volt value is a linear relationship, the fitting scale factor of the system is 0.94, the fitting extent is 0.9752 and vibration acceleration demodulation can be realized in the range of 0~4.7g of the acceleration of vibration signal.
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