Hidden metallic object localization by using giant magnetic resistor sensors

Werner Renhart (Institute for Fundamentals and Theory in Electrical Engineering, Graz University of Technology, Graz, Austria)
Mario Bellina (Institute for Fundamentals and Theory in Electrical Engineering, Graz University of Technology, Graz, Austria)
Christian Magele (Institute for Fundamentals and Theory in Electrical Engineering, Graz University of Technology, Graz, Austria)
Alice Köstinger (Institute of Medical Engineering, Graz University of Technology, Graz, Austria)

Abstract

Purpose

The purpose of this paper is to achieve a very accurate localization of hidden metallic objects in human medicine applications.

Design/methodology/approach

The proposed methodology takes advantage of the eddy current effect within a metallic object. Its magnetic reaction field will be measured, e.g. with giant magnetic resistor (GMR) sensors.

Findings

A comparison of measurements and numerical results obtained by finite element computations demonstrate the reliability and positively gives a clue about the feasibility of the suggested method.

Research limitations/implications

While measuring noisy signals, the use of a lock‐in amplifier is rather expensive; especially, in applications with a high number of GMR sensors the use of channel multiplexer must be considered, which again may generate noise.

Originality/value

The paper shows how appropriate shielding of external fields in the measurement setup ensures results of satisfying quality.

Keywords

Citation

Renhart, W., Bellina, M., Magele, C. and Köstinger, A. (2011), "Hidden metallic object localization by using giant magnetic resistor sensors", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 30 No. 6, pp. 1927-1937. https://doi.org/10.1108/03321641111168200

Publisher

:

Emerald Group Publishing Limited

Copyright © 2011, Emerald Group Publishing Limited

To read the full version of this content please select one of the options below

You may be able to access this content by logging in via Shibboleth, Open Athens or with your Emerald account.
To rent this content from Deepdyve, please click the button.
If you think you should have access to this content, click the button to contact our support team.