Effect of terminations in magnetic wire on the noise of orthogonal fluxgate operated in fundamental mode
Effect of terminations in magnetic wire on the noise of orthogonal fluxgate operated in fundamental mode
复制标题
磁线终端对基模工作的正交磁通门噪声的影响
DOI：
10.1109/tmag.2011.2173176
复制
发表时间：
2012
影响因子：
2.1
通讯作者：
I.Sasada
中科院分区：
文献类型：
--
作者：
M.Butta;I.Sasada
在过去的十年中，正交磁通门主要是由磁微丝和拾取线圈组成。这种结构有几个优点，但它使用了有限长度的铁心和传统的基于圆柱体磁芯的正交磁通门。在开路磁路的磁芯上施加轴向磁场，因此受导线长度的影响。在这篇文章中，我们比较了不同长度的传感头和线芯：长度较长的线芯产生的噪声明显较低(在1赫兹时约为4pT/√赫兹，而对于短线则为7？8)。事实上，与导线的中心部分相比，终端的饱和度似乎要低一些。此外，我们还说明了末端对总灵敏度的贡献是如何减少的。最后，对导线的结构进行了有限元模拟，结果表明，退磁效应完全描述了导线对轴向场的不同响应。因此，我们建议使用较长的导线，使端子尽可能远离拾取线圈，以便从导线较均匀的部分获得输出信号。
During the last decade orthogonal fluxgates have been mainly manufactured using magnetic micro wire surrounded by a pick-up coil. This structure has several advantages, however it employs a finite length core as well as traditional orthogonal fluxgates based on cylindrical bulk core do. The measured field on axial direction is applied on a magnetic core with open magnetic circuit, which is therefore affected by the length of the wire. In this paper we compare sensor heads with wire-core having different length: the resulting noise is significantly lower for longer core (about 4 pT/√Hz at 1 Hz vs. 7 ÷ 8 for short wire). In fact, the terminations appear less saturable than the central part of the wire. Moreover, we show how the ends contribute less to the total sensitivity. Finally we model by FEM simulation the structure of the wire and we show that the different response of the wire to the axial field is fully described by demagnetizing effect. Therefore, we suggest to use a long wire keeping the termination if possible out of the pick-up coil in order to obtain the output signal from the more uniform part of the wire.