Evaluation of the thin-skin approximation boundary element method for electromagnetic induction scattering problems
Evaluation of the thin-skin approximation boundary element method for electromagnetic induction scattering problems
复制标题
电磁感应散射问题薄皮近似边界元法的评估
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
A. Peyton
中科院分区：
文献类型：
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作者：
M. O’Toole;J. L. Davidson;L. A. Marsh;W. Yin;A. Peyton
受外加变化磁场作用的导电物体将发出二次磁场或散射场。散射场取决于物体的几何形状及其材料特性（电导率、渗透率等）。如果我们可以计算出给定几何形状的散射场（散射问题），我们就可以从探测到的电磁响应推断出材料的性质。我们的动机是为对象和材料分类生产基于归纳的分类器。应用包括分类高价值的废金属和识别地雷清除中的未爆弹药。为此，我们需要快速准确地解决散射问题的方法。本文对薄皮近似边界元法进行了评价。该方法为散射问题提供了一个特别紧凑的公式，求解起来很快。我们将这种方法与更成熟的有限元方法进行比较。我们发现，较大的物体在较高的频率和电导率似乎给出了良好的协议之间的两种方法。然而，对于较小的物体，即使对于典型的基于感应的传感来说，频率或电导率相对较高，该协议也会失效。当物体具有复杂的几何形状时尤其如此。这就限制了这种方法的实际用途。
A conductive object subject to an applied varying magnetic field will emit a secondary magnetic field or scattered field. The scattered field is dependent on the geometry of the object and its material properties (conductivity, permeability, etc). If we can calculate the scattered field for a given geometry (the scattering problem), we can infer the material properties from the detected electromagnetic response. Our motivation is the production of induction based classifiers for object and material classification. Applications include sorting of high value scrap metal and identifying UXO from clutter in landmine clearance. To this end, we require methods of solving the scattering problem quickly and accurately. In this paper, we evaluate the thin-skin approximation boundary element method. The method offers a particularly compact formulation of the scattering problem which is quick to solve. We compare this method to the more established finite element method. We find that larger objects at higher frequencies and conductivities appear to give good agreement between the two methods. However, the agreement breaks down for smaller objects even when the frequency or conductivity is relatively high for typical induction based sensing. This is especially true when the object has a complex geometry. This imposes limitations on the practical usefulness of this approach.
使用步入式金属探测器进行三维物体定位和单频率磁极化张量的反演
影响因子：
2.4
作者：
Marsh L
通讯作者：
Marsh L
使用 WTMD 门户提高金属物体分类的可靠性
影响因子：
2.4
作者：
Makkonen J
通讯作者：
Makkonen J