A Very-Low-Frequency Electromagnetic Inductive Sensor System for Work-piece Recognition Using the Magnetic Polarizability Tensor

Research output: Research - peer-reviewArticle

  • External authors:
  • Yang Tao
  • Wenbo Zhang
  • Yifei Zhao
  • Christos Ktistis


The automatic recognition of a metal component or work-piece currently relies on optical techniques and image matching. It is not possible to distinguish work-pieces with different materials. In this paper, a novel electromagnetic inductive sensor array similar to those used in the electromagnetic tomography (EMT) has been designed to address this problem. Furthermore, instead of reconstructing the full magnetic polarizability tensor, we have proposed a partial tensor approach, which shows that a 2D tensor is capable of distinguishing the material difference and recognising the geometric dominance of work-pieces with experimental data. In addition, it has been found that the phase of the tensor is strongly linked to the materials properties while the magnitude of the tensor eigenvalues implies the basic geometry of work-piece.

Bibliographical metadata

Original languageEnglish
Pages (from-to)2703-2712
Number of pages10
JournalIEEE Sensors Journal
Issue number9
Early online date1 Mar 2017
StatePublished - 1 May 2017