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利用光纤布拉格光栅(fiber Bragg grating,FBG)对应力敏感,设计了一种流量传感装置。置于流体中的靶片感受到流体的冲击力,使FBG发生轴向应变,从而引起FBG反射谱发生变化,可用于一定范围内对液体流量的实时测量。理论分析和实验结果显示Bragg波长改变量与流量呈现良好的平方关系,进行二项式拟合,其相关系数为0.996。该FBG流量计结构简单,操作方便,在最大流量处的灵敏系数为5.31 L·min~(-1)/nm,精度系数为0.11 L·min~(-1),测量范围为0~4.5 L·min~(-1)。
A stress sensing device based on fiber Bragg grating (FBG) is designed. The target film placed in the fluid feels the impact force of the fluid to cause the axial strain of the FBG to cause the change of the FBG reflection spectrum, which can be used to measure the liquid flow in a certain range in real time. Theoretical analysis and experimental results show that there is a good square relationship between the amount of Bragg wavelength change and the flow rate, and binomial fitting is performed with a correlation coefficient of 0.996. The FBG flowmeter has the advantages of simple structure and convenient operation, the sensitivity coefficient at the maximum flow rate is 5.31 L · min -1 / nm, the accuracy coefficient is 0.11 L · min -1, and the measuring range is 0 to 4.5 L · Min ~ (-1).