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Low-cost Sensors Based on the GMI Effect in Recycled Transformer Cores

机译：基于GMI效应的低成本变压器磁芯传感器

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摘要

Sensors based on the giant magnetoimpedance (GMI) effect in silicon steels were constructed. Strips of silicon steels (0.500 mm-thick, 35.0 mm-long) with widths ranging from 0.122 to 1.064 mm were cut from recycled transformer cores. Since a maximum GMI ratio of 300% and a maximum field sensitivity of 1.5%/Oe were observed in a 1.064 mm-wide sample at 200 kHz, the 1.064 mm-wide strips were chosen as sensing elements in a slot key switch, angular velocity sensor, current sensor and force sensor. The sensing elements were integrated into electronic circuits and the changes in impedance were monitored. Variations in voltage due to these changes were typically small and must therefore be amplified by the electronic circuits. For the current sensor and force sensor, the variation in the voltage drop across the GMI sensing element had non-linear variations with either current or force and a conversion formula from a computer program was therefore needed. The performance of the systems was tested. These sensing systems were stable, highly sensitive, hysteresis-free and could be produced on a mass scale. Based on their GMI effect, the silicon steels are versatile alternative low-cost sensors.
机译：构造了基于硅钢中巨磁阻抗（GMI）效应的传感器。从回收的变压器铁心上切下宽度从0.122到1.064 mm的硅钢带（0.500毫米厚，35.0毫米长）。由于在200 kHz下在1.064 mm宽的样品中观察到最大GMI比率为300％，最大场灵敏度为1.5％/ Oe，因此在插槽键开关中选择了1.064 mm宽的条作为传感元件，角速度传感器，电流传感器和力传感器。传感元件被集成到电子电路中，并监测阻抗的变化。由于这些变化而引起的电压变化通常很小，因此必须由电子电路放大。对于电流传感器和力传感器，GMI传感元件两端的电压降变化随电流或力呈非线性变化，因此需要计算机程序的转换公式。测试了系统的性能。这些传感系统稳定，高度灵敏，无滞后，可大规模生产。基于它们的GMI效应，硅钢是通用的替代低成本传感器。

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