Buznikov Nikita A, Kurlyandskaya Galina V
Institute for Theoretical and Applied Electromagnetics, Russian Academy of Sciences, Moscow 125412, Russia.
Institute of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg 620002, Russia.
Sensors (Basel). 2024 Jun 5;24(11):3669. doi: 10.3390/s24113669.
The recently proposed magnetoimpedance tomography method is based on the analysis of the frequency dependences of the impedance measured at different external magnetic fields. The method allows one to analyze the distribution of magnetic properties over the cross-section of the ferromagnetic conductor. Here, we describe the example of theoretical study of the magnetoimpedance effect in an amorphous microwire with inhomogeneous magnetic structure. In the framework of the proposed model, it is assumed that the microwire cross-section consists of several regions with different features of the effective anisotropy. The distribution of the electromagnetic fields and the microwire impedance are found by an analytical solution of Maxwell equations in the particular regions. The field and frequency dependences of the microwire impedance are analyzed taking into account the frequency dependence of the permeability values in the considered regions. Although the calculations are given for the case of amorphous microwires, the obtained results can be useful for the development of the magnetoimpedance tomography method adaptation for different types of ferromagnetic conductors.
最近提出的磁阻抗断层成像方法基于对在不同外部磁场下测量的阻抗的频率依赖性分析。该方法能够分析铁磁导体横截面上磁特性的分布。在此，我们描述了具有非均匀磁结构的非晶微丝中磁阻抗效应的理论研究示例。在所提出模型的框架内，假设微丝横截面由几个具有不同有效各向异性特征的区域组成。通过在特定区域对麦克斯韦方程进行解析求解，得到了电磁场分布和微丝阻抗。考虑到所考虑区域磁导率值的频率依赖性，分析了微丝阻抗的场和频率依赖性。尽管计算是针对非晶微丝的情况，但所得结果对于开发适用于不同类型铁磁导体的磁阻抗断层成像方法可能是有用的。
