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Metal detector coil arrangement for uniform internal and zero external sensitivity

TitleMetal detector coil arrangement for uniform internal and zero external sensitivity
Publication TypeJournal Article
Year of Publication2008
AuthorsDhagat, P., A. Jander, and D. Luo
JournalJournal of Applied Physics
Volume103
Issue7
Pagination07E919 - 07E919-3
Date Published2008
ISSN00218979
Abstract

A design for transmit and receive coils of walk-through metal detectors is presented. The coil arrangements, emulating magnetization patterns of one sided flux sources, provide highly uniform detection sensitivity within the walk-through portal and low detection sensitivity outside of the portal. The spatial distribution of magnetic field vectors produced by the coils were calculated and show the desired field cancellation on one side of the structure and field strength decaying approximately exponentially with distance from the active side. The proposed metal detector design combines one sided excitation and receive coils on either side of the portal such that the exponentially decreasing excitation fields together with the exponentially increasing receive sensitivity results in uniform detection throughout the portal. The absence of fields produced outside of the portal results in low detection of external objects.

URLcoils , electromagnetic induction , electromagnets , magnetic flux , magnetic sensors , magnetisation , metals , weapons
DOI10.1063/1.2833757
Short TitleJ. Appl. Phys.