基于光电检测的振弦式应变传感器的设计与实现

摘要

设计并实现了一种采用单线圈电磁激振以及透射型光电传感器拾振的振弦式应变传感器，并进行了实验验证。另外，为方便进行温度补偿实验，在机械结构中加入应力施加单元，同时加入标准拉力传感器直接测量振弦所受应力，对实验进行验证。建立了阻尼作用下振弦自由振动的数学模型，并利用ANSYS进行了仿真，实验结果与理论计算以及仿真结果具有高度一致性。信号解算方法精度可达2με。%A vibration wire strain sensor based on photoelectric detection is designed. The sensor uses one coil to ex-cite the vibrating wire and a photoelectric sensor to pick up the vibration of vibrating wire. And it’s verified by ex-periments. Moreover,the device to fix the vibrating wire is optimized, making it closer to the model of Double-Clamped. The mathematical model of the vibration wire with the damping effect is established,and the simulation is carried out by ANSYS. The experimental results,theoretical calculation and simulation results have preferably coher-ence. The accuracy of the way to process the signal reaches 2 με.