Measuring the Magnetic Polarizability Tensor of Nonsymmetrical Metallic Objects
Measuring the Magnetic Polarizability Tensor of Nonsymmetrical Metallic Objects
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测量非对称金属物体的磁极化率张量
DOI：
10.1109/jsen.2023.3296439
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发表时间：
2023
影响因子：
4.3
通讯作者：
Özdeger T
中科院分区：
文献类型：
--
作者：
Özdeger T
极化率张量（MPT）是金属物体的代表性电磁特性，它取决于物体的尺寸、材料、形状和激励频率。MPT可用于描述金属探测器系统的响应，并在利用电磁感应光谱的应用中提高目标分类性能。然而，对于目标表征，需要创建可能的目标对象的库，其可用于训练机器学习分类器。为了补充和基准测试我们现有的模拟和测量MPT对象表征库，有必要能够准确有效地测量对象表征。本文介绍了一种新的方法，利用截断二十面体形状的机械手和程序来测量MPT特性的非对称，不规则的对象。这种新方法允许测量任何适当大小的物体的MPT。该方法还确保了MPT特性的快速测量和良好的设置，而不会牺牲精度。通过比较使用新方法获得的实验结果与使用对称对象的较慢方法获得的实验结果以及使用商业有限元软件包和优化的专用开源MPT计算器软件包生成的合成结果，验证了该方法的性能，该软件包提供了高精度和相当大的计算优势。新方法和其他三种方法之间的良好协议。对于已经表征的所有对象，来自所有描述的方法的MPT损耗峰值幅度和水平位置在最坏情况下彼此在5%内。
The magnetic polarizability tensor (MPT) is a representative electromagnetic property of a metallic object, which depends on the size, material, shape, and excitation frequency of the object. The MPT can be used to describe the response of metal detector systems and improve target classification performance in applications utilizing electromagnetic induction spectroscopy. However, for target characterization, a library of possible target objects needs to be created, which can be used for training machine learning classifiers. To supplement and benchmark our existing library of simulated and measured MPT object characterizations, it is necessary to be able to measure object characterizations accurately and efficiently. This article describes a novel method utilizing a truncated icosahedron-shaped manipulator and procedure to measure MPT characterizations of nonsymmetrical, irregular objects. This new method allows the measurement of the MPT of any appropriately sized object. The method also ensures that the MPT characterizations are measured quickly and are well posed, without sacrificing accuracy. The performance of the method is validated by comparing the experiment results acquired using the new method with experiment results acquired using a slower method for symmetrical objects as well as synthetic results generated using a commercial finite element package and an optimized dedicated open-source MPT-calculator package, which offers high accuracy and considerable computational advantages. Good agreement between the new method and the other three methods is seen. For all objects that have been characterized, MPT loss-peak magnitude and horizontal positions from all described methods are within 5% of each other at worst.
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