实验研究了磁致伸缩位移传感器的探测电压信号,以便提高磁致伸缩位移传感器的检测精度。分析和验证了波导丝材料、驱动脉冲电流、检测线圈等参数对磁致伸缩位移传感器输出电压的影响规律。对检测线圈进行了优化设计, 基于实验数据确定了传感器的各项参数值。实验发现磁致伸缩系数大、魏德曼效应显著的Fe-Ga材料作为波导丝, 可明显提高电-磁-机械能的转换效率, 获得较大的检测电压信号。研制了新型Fe-Ga波导丝磁致伸缩位移传感器样机, 并与Fe-Ni波导丝传感器进行了性能对比。结果表明, 与Fe-Ni波导丝相比, Fe-Ga波导丝磁致伸缩位移传感器的检测信号明显增强, 信噪比显著提高, 其检测电压信号幅值比Fe-Ni波导丝检测电压信号幅值提高了40 mV, 相应的传感器精度提高了2倍。

The detecting voltage signal of a magnetostrictive displacement sensor was experimentally studied to improve its detection accuracy. The effects of waveguide wire materials, driving pulse currents, and detecting coil parameters on the detecting voltage signal were analyzed and confirmed. The detecting coil was designed optimally and the parameters for the magnetostrictive displacement sensor were determined. The research shows since the Fe-Ga waveguide has a larger magnetostrictive coefficient and remarkable Weidmann effect , it improves the electric-magnetic-mechanical conversion efficency and obtains more detecting voltage signals. Based on the experimental results, a new type of magnetostrictive displacement sensor with the Fe-Ga waveguide wire was fabricated and its performance was compared with that of a magnetostrictive displacement sensor with the Fe-Ni waveguide wire. The research shows that the detecting signal for the magnetostrictive displacement sensor with the Fe-Ga waveguide wire is obviously enhanced and the signal-to-noise ratio is improved significantly as compared with that with the Fe-Ni waveguide wire. Moreover, the detecting voltage signal amplitude for the magnetostrictive displacement sensor with the Fe-Ga wire increases 40 mV and its detection precision may be 2 times that of the sensor with the Fe-Ni wire.