基于光纤光栅的小量程称重传感器设计

设计了一种小量程光纤布拉格光栅称重传感器,采用双孔单槽式悬臂梁型弹性体结构,并利用有限元软件ANSYS对弹性体结构进行优化设计,以满足小量程设计要求。采用四片光纤光栅布片方式,提高了传感器的灵敏度,并利用正应变和负应变的光纤光栅信号进行叠加,以补偿温度的影响。对传感器进行加载卸载实验,并对所设计的传感器进行了整体性能分析,实验结果表明,传感器的称重范围为0-4kg,线性度误差小于0.9%,温度补偿达到了一定效果,性能稳定,证明了设计方法的可行性。

Design of Small-Scale Weighing Sensor Based on FBG

The method of a small -scale fiber Bragg grating （FBG） weighing sensor design was presented in this pa- per. A two - hole cantilever was selected as the elastomer structure, and an optimum design was carried on using the finite element software ANSYS method to meet the small - scaled design requirements. Using four FBG chips as sensing elements, the sensitivity of the sensor can be increased. With the superimposed the positive and negative strain single, the temperature compensation is easy to be implemented. The experiments of loading and unloading test were carried out, and the overall performances of the sensor were analyzed. The experiment results show that the weighing range of the sensor is 0 -4 kg, and the linearity error is less than 1%, the temperature compensation is achieved a certain effect, the performance is stable. The design method of the sensor is proved to be feasible.