On the Low-Frequency Electromagnetic Responses of In-Line Metal Detectors to Metal Contaminants
On the Low-Frequency Electromagnetic Responses of In-Line Metal Detectors to Metal Contaminants
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DOI：
10.1109/tim.2014.2324791
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发表时间：
2014-06
影响因子：
5.6
通讯作者：
Yifei Zhao;W. Yin;C. Ktistis;D. Butterworth;A. Peyton
中科院分区：
文献类型：
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作者：
Yifei Zhao;W. Yin;C. Ktistis;D. Butterworth;A. Peyton
本文考虑了一种偶极子解决方案，用于解决典型在线金属探测器对金属污染物的低频电磁响应。该方案由金属目标和入射磁场的特性决定，将金属目标和入射磁场分别视为两个独立因素。对于金属目标，确定球体和线材样品的响应。金属球的电磁极化率矩阵直接根据球面响应函数计算得出。金属线的电磁极化率张量由测量的特征值矩阵和旋转矩阵导出。所提出的解决方案中球体和线材样品的近似响应与在线金属探测器的测量响应非常吻合。理论上，金属丝样品的近似方法也适用于其他形状的金属污染物。
This paper considers a dipole solution to the low-frequency electromagnetic responses of a typical in-line metal detector to metal contaminants. This solution is determined by the characteristics of metal targets and incident magnetic fields, which are treated separately as two independent factors. For the metal targets, the responses of sphere and wire samples are determined. The electromagnetic polarizability matrix of a metal sphere is directly computed from a spherical response function. The electromagnetic polarizability tensor of metal wire is derived from a measured eigenvalue matrix and a rotation matrix. The approximated responses of sphere and wire samples from the proposed solutions agree well with the measured responses from in-line metal detectors. In theory, the approximation method on metal wire samples is also applicable to the metal contaminants of other shapes.