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Demagnetizing Field Effect on the Detection Range of a Galfenol-Based Magnetic Field Sensor

机译:消磁磁场对基于Galfenol的磁场传感器检测范围的影响

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摘要

This paper investigates the new developments of a class of magnetic field sensors based on the integration of Iron-Gallium magnetostrictive alloys (Galfenol) and fiber Bragg gratings used to detect the magneto-induced mechanical strain. This kind of sensor has the advantage of being able to work also in harsh environments, but on the other hand cannot detect fields beyond 10 kA/m, because of the magnetic softness of the active material. A simple solution consists in the exploitation of the demagnetizing field experienced by the ferromagnetic alloy by effect of its magnetization, generated by the application of the external magnetic field. Since the demagnetizing field effect depends only on geometrical parameters, the use of samples with different aspect ratios allows us to check how the shape of the active material can be used as a control parameter of the sensor detection range.
机译:本文研究了基于铁-镓磁致伸缩合金(Galfenol)和用于检测磁感应机械应变的光纤布拉格光栅的集成的一类磁场传感器的最新进展。这种传感器的优点是即使在恶劣的环境下也能工作,但是另一方面,由于活性材料的磁性很弱,因此无法检测到超过10 kA / m的磁场。一种简单的解决方案包括利用铁磁性合金的磁化作用来利用铁磁性合金所经历的退磁场,所述磁化作用是通过施加外部磁场而产生的。由于消磁场效应仅取决于几何参数,因此使用具有不同长宽比的样品使我们能够检查活性材料的形状如何用作传感器检测范围的控制参数。

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