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为增大检测信号的输出幅值和降低反射波对测量精度的影响,在传统磁致伸缩位移传感器结构基础上,提出一种基于无阻尼扭转波干涉的位移测量方法.制作了Fe-Ga磁致伸缩位移传感器样机,检测线圈输出的电压幅值由42 mV提高到65 mV,信噪比由11.6 dB提高到22.5 dB,位移分辨力提高1倍.对扭转波的两种时间定位方法进行分析,提出了一种动态双侧阈值法的时间定位方法,给出了此方法使用的范围及阈值选取的方法,推导了此方法所能提高的测量精度,并通过实验证明了此方法的测量精度约提高了1倍.
In order to increase the output amplitude of the detection signal and reduce the influence of the reflected wave on the measurement accuracy, based on the traditional structure of the magnetostrictive displacement sensor, a displacement measurement method based on undisturbed torsional wave interference is proposed. The Fe-Ga magnetic The results show that the amplitude of the voltage output from the detection coil increases from 42 mV to 65 mV and the SNR increases from 11.6 dB to 22.5 dB and the displacement resolution increases by 1. The two methods for time-location of torsional waves are analyzed , Proposed a dynamic two-time threshold method of time location, given the scope of the method used and threshold selection method, derived by this method can improve the measurement accuracy, and proved by experiments that the accuracy of this method Approximately doubled.