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Improving reliability for classification of metallic objects using a WTMD portal

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Original languageEnglish
Article number105103
JournalMeasurement Science and Technology
Issue number10
Publication statusPublished - 26 Aug 2015
Publication typeA1 Journal article-refereed


In this paper, a walk-through metal detection (WTMD) portal is used for classification of metallic objects. The classification is based on the inversion of the magnetic polarisability tensor (tensor) of the object. The nature of bias and noise components in the tensor are examined by using real walk-through data, and consequently, a novel classifier is introduced. Furthermore, a novel method for detecting poorly inverted tensors is presented, enabling self-diagnostics for the WTMD portal. Based on the results, the novel methods increase the accuracy of metal object classification and have the potential to improve the reliability of a WTMD system.

ASJC Scopus subject areas


  • bias, classification, eigenvalues, electromagnetic polarisability, noise, tensor, WTMD

Publication forum classification

Field of science, Statistics Finland