磁致伸缩液位传感器双检测线圈温度补偿与噪声抑制

Temperature compensation and noise suppression for magnetostrictive liquid level sensor using double detection coils

为了校正扭转波速度、补偿温度、抑制脉冲电流噪声以及提高输出信号的信噪比,设计了一种双检测线圈结构应用于磁致伸缩液位传感器。推导了扭转波速度与温度的数学模型,得到了扭转波速度随温度的变化趋势;分析了单检测线圈结构存在温度影响测量结果与脉冲电流幅值大等问题。通过理论分析,最终的实验结果表明,与单检测线圈结构相比,双检测线圈结构能够快速计算扭转波速度,补偿温度对测量结果的影响,将脉冲电流噪声信号幅值降低至原来的1/27,测量误差由原来的0.18mm降低至0.02mm。双检测线圈结构为磁致伸缩液位传感器优化设计提供了理论指导。

To correct the torsional wave velocity,compensate for the effect of temperature,suppress the pulse current noise,and improve the signal-to-noise ratio of the output signal,a double detection coil structure was designed for a magnetostrictive liquid level sensor.A mathematical model of the torsional wave velocity and temperature was derived,and the relationship between them obtained.The temperature affected the measurement results and the amplitude of pulse current was seen to be larger;these issues of single coil structures were analyzed.The theoretical analysis and experimental results show that,compared with the single detection coil structure,the double detection coil structure leads to faster calculations of the torsional wave velocity and compensates for the effect of temper-ature on the measurement results.The amplitude of the pulse current noise signal is reduced to the original1/27,and the measurement error is reduced from the original 0.18 to 0.02 mm.The double detection coil structure provides theoretical guidance for the optimal design of magnetostrictive liquid level sensors.