The spectral properties of the magnetic polarizability tensor for metallic object characterisation
The spectral properties of the magnetic polarizability tensor for metallic object characterisation
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DOI：
10.1002/mma.5830
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发表时间：
2019-06
影响因子：
2.9
通讯作者：
P. Ledger;W. Lionheart
中科院分区：
文献类型：
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作者：
P. Ledger;W. Lionheart
在一定频率范围内测量时谐扰动场数据有利于实际金属探测，其目标是定位和识别隐藏目标。特别地，当使用频率相关的磁极化率张量（MPT）来提供导电可渗透物体的经济表征并且采用基于字典的分类器时，这些益处得以实现。然而，尽管基于字典的分类器具有优势，但MPT系数随频率的行为并未得到正确理解。在本文中，我们严格分析，第一次，MPT的系数的谱特性。这种分析有可能改进现有的算法，并设计新的方法，用于金属检测中的物体定位和识别。我们的分析还使响应瞬态响应从一个导电的可渗透的对象进行预测更一般形式的激励。
The measurement of time‐harmonic perturbed field data, at a range of frequencies, is beneficial for practical metal detection, where the goal is to locate and identify hidden targets. In particular, these benefits are realised when frequency‐dependent magnetic polarizability tensors (MPTs) are used to provide an economical characterisation of conducting permeable objects, and a dictionary‐based classifier is employed. However, despite the advantages shown in dictionary‐based classifiers, the behaviour of the MPT coefficients with frequency is not properly understood. In this paper, we rigorously analyse, for the first time, the spectral properties of the coefficients of the MPT. This analysis has the potential to improve existing algorithms and design new approaches for object location and identification in metal detection. Our analysis also enables the response transient response from a conducting permeable object to be predicted for more general forms of excitation.