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设计了一种基于等强度悬臂梁的靶式光纤Bragg光栅(FBG)流速传感器,传感器利用杠杆结构将置于流体中迎流靶片所受的与流速成对应关系的冲击力转化成FBG波长的漂移,利用对称粘贴于悬臂梁上下表面的双FBG结构有效解决了温度与应变的交叉敏感问题。建立了流速与FBG波长变化幅度的关系,并采用流体分析软件FLUENT对放置靶片的流体管道流场进行仿真。仿真结果表明,在靶径比为0.7的管道系统中,传感器灵敏系数为2.54×10-3s2/m2。对传感器进行标定试验,得传感器分辨率为0.02m/s,在0～1.40m/s范围内最大满量程误差为1.5%FS。
A target fiber Bragg grating (FBG) velocity sensor based on isotemperature cantilever beam is designed. The sensor uses the lever structure to convert the impulsive force corresponding to the flow velocity into the target wave plate placed in the fluid into FBG wavelength Drift, the use of symmetrical paste on the upper and lower surface of the cantilever double FBG structure effectively solve the temperature and strain cross-sensitive issues. The relationship between the flow rate and the wavelength of FBG was established, and the fluid flow field of the target plate was simulated by FLUENT software. The simulation results show that the sensitivity coefficient of the sensor is 2.54 × 10-3s2 / m2 in the pipeline system with a target ratio of 0.7. The sensor calibration test, the sensor resolution of 0.02m / s, in the range of 0 ~ 1.40m / s maximum full scale error of 1.5% FS.