Three-dimensional object location and inversion of the magnetic polarizability tensor at a single frequency using a walk-through metal detector
Three-dimensional object location and inversion of the magnetic polarizability tensor at a single frequency using a walk-through metal detector
复制标题
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
DOI：
10.1088/0957-0233/24/4/045102
复制
发表时间：
2013
影响因子：
2.4
通讯作者：
Marsh L
中科院分区：
文献类型：
--
作者：
Marsh L
为了在探测器空间内恢复磁性和/或导电物体的信息，设计并构建了一个层析金属探测和表征系统。这些信息是通过对候选者进行“遍历”扫描而收集的，其方式与典型的安全金属探测器拱门相同。在候选物体通过后，系统使用线圈阵列的测量值来计算极化张量，极化张量描述了小型金属物体与交流磁场相互作用时的低频电磁特性。除了磁极化率并进张量外，扰动的位置也被确定为反演算法的乘积。该系统已经过测试，能够在< 20%的典型参数变化情况下反演物体张量，并以小于±3 cm的典型误差确定三维物体位置。在本文中，结果显示了一组四个不同的测试对象的例子，每一个都有不同的磁极化张量。这个物件集由一个铁氧体球体，一个铁氧体棒和虚幻的铝和钢手枪形状组成。
A tomographic metal detection and characterization system has been designed and built for recovering information about magnetic and/or conductive objects within the detector space. This information is gathered as a result of a'walk-through'scan of a candidate in the same manner as for a typical security metal detector archway. Following the passage of the candidate, the system uses measurements from an array of coils to calculate the polarizability tensor, which describes the low frequency electromagnetic characteristic of a small metallic object when it interacts with an ac magnetic field. In addition to the magnetic polarizability dyadic tensor, the position of the perturbation is also determined as a product of the inversion algorithm. The system has been tested and is capable of inverting object tensors with< 20% typical parameter variation, and determines three-dimensional object location with a typical error of less than±3 cm. In this paper, results are shown from a set of four different test object examples, each with a different magnetic polarizability tensor. This object set consists of a ferrite sphere, a ferrite rod and phantom aluminium and steel handgun shapes.