Hidden metallic object localization by using giant magnetic resistor sensors

• Werner Renhart ^[1] ; Mario Bellina ^[1] ; Christian Magele ^[1] ; Alice Köstinger ^[1]
  1. [1] Graz University of Technology

     Graz University of Technology

     Graz, Austria

     
• Localización: Compel: International journal for computation and mathematics in electrical and electronic engineering, ISSN 0332-1649, Vol. 30, Nº 6 (Special Issue: Advances in Computational Electromagnetics), 2011, págs. 1927-1937
• Idioma: inglés
• Enlaces
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• Resumen

  • 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.