Magnetic sheet-backed search coil for pulsed-induction metal detector system

Author

Bobae Kim ; Seung-eui Lee ; Seung-hoon Han ; Kangwook Kim

Author_Institution

Sch. of Mechatron., Gwangju Inst. of Sci. & Technol. (GIST), Gwangju, South Korea

Volume

50

Issue

23

fYear

2014

fDate

11 6 2014

Firstpage

1704

Lastpage

1706

Abstract

Magnetic sheet backing of the search coil is proposed to improve the detection range of a pulsed-induction (PI) metal detector (MD) system. A planar square spiral mono coil is printed on an FR-4 substrate, and layers of magnetic sheets are attached to the substrate. The coil geometry is modelled using the finite-element method, and the static magnetic field distributions are compared. With the magnetic sheet backing, the magnetic field is shown to increase in the target direction and to decrease in the opposite direction. The coils are fabricated and applied to a PI MD system. It is demonstrated that the proposed magnetic sheet-backed search coils have longer detection ranges than the coil without magnetic sheet backing.

Keywords

coils; finite element analysis; magnetic fields; metal detectors; sheet materials; FR-4 substrate; PI MD system; PI metal detector system; coil geometry; detection range; finite-element method; magnetic sheet backing; magnetic sheet-backed search coils; magnetic sheets; planar square spiral mono coil; pulsed-induction metal detector system; static magnetic field distributions;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el.2014.2116

Filename

6955136