提高电感传感器测量灵敏度的方法

摘要

电感位移传感器被广泛应用于微小位移量检测中,但在一些工程中现有传感器的测量精度和灵敏度达不到测量要求。针对这一问题,对传感器前段信号处理电路进行改进,在传感器上下线圈并联电容形成LC电路,利用LC电路谐振效应改善电路的性能,以提高信号源头的灵敏度;采用Multisim软件对半桥和全桥电路在并联不同大小的电容后的性能进行仿真,并用Matlab对生成的曲线进行最小二乘拟合,比较得出使电路性能最优的电容值和并联方法。结果表明在损失微小线性度的情况下可将灵敏度提高一倍。%The inductance displacement sensor is widely used in small displacement detection.However,in some existing engineering sensors measurement precision and sensitivity can not reach the measurement requirements.Based on this problem,a sensor signal processing circuit is improved.An LC circuit is formed by including capacitance in the coil.The LC circuit resonant effect can improve circuit performance and improve the sensitivity of the signal source.Multisim software is adopted to simulate the performance of the half-and-half bridge and the whole bridge circuit when they include a capacitance of a different size capacitance.Matlab is used to fit the curve of the least squares.The capacitance and paralleling method for the optimal performance of the circuit are obtained through comparison.The results show that a little damage to the linearity can double sensitivity.