The purpose of this paper is to achieve a very accurate localization of hidden metallic objects in human medicine applications.
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.
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.
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.
The paper shows how appropriate shielding of external fields in the measurement setup ensures results of satisfying quality.
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
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