An Impedance-Permeability Self-Resonance of Inductance Coil with Metamaterials
An Impedance-Permeability Self-Resonance of Inductance Coil with Metamaterials
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DOI：
10.2528/pier12122408
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发表时间：
2013
影响因子：
6.7
通讯作者：
Qiang Yu;Qian Zhao;Y. Meng
中科院分区：
文献类型：
--
作者：
Qiang Yu;Qian Zhao;Y. Meng
首次在电感线圈中引入负磁导率的电磁超材料，发现了阻抗-磁导率（Z-”r）共振现象，并进行了数值模拟。数值结果表明，在相对磁导率为负值时，阻抗-磁导率关系表现出一种特殊的自谐振现象，这种自谐振现象与铁芯尺寸有关，而与线圈尺寸几乎无关。该机制可将涡流传感器的灵敏度提高约270倍，为大幅度提高涡流传感器的灵敏度和微米尺度的空间分辨率提供了一种新方法。
An impedance-permeability (Z-"r) resonance phenomenon is flrstly found and numerically demonstrated when electromag- netic metamaterials with negative permeability are flrstly introduced into inductance coil. Numerical results reveal that the impedance- permeability relationship exhibits an extraordinary self-resonant phe- nomenon at a certain negative value of relative permeability, which is related to the dimensions of the core but nearly independent of the coil size. Such a mechanism is proposed to increase the sensitivity of eddy current (EC) sensors up to about 270 times, ofiering a new method to greatly improve the sensitivity of EC sensors and the spatial resolution with micrometer scale.