Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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2D Location Estimation of a Magnetized Tip Using Arrayed GMR Sensors

GMR센서 배열을 이용한 자석팁의 2D 위치 추정

  • Lee, S.C. (School of Mechtronical Engineering, Pusan National Unversity) ;
  • Kim, J.K. (School of Mechtronical Engineering, Pusan National Unversity) ;
  • Ahn, J.H. (School of Mechtronical Engineering, Pusan National Unversity) ;
  • Kim, H.Y. (School of Mechtronical Engineering, Pusan National Unversity)
  • Received : 2019.10.23
  • Accepted : 2019.11.27
  • Published : 2019.11.30
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Abstract

This paper proposes a method for estimating the location of a magnetized tip that is inside a non-transparent space or body by using arrayed giant magnetoresistance (GMR) sensors. In general, an object located in such an opaque space can be detected using X-rays, magnetic fields, ultra-sonic sensors, etc., depending on its characteristics. X-ray is mostly used for medical purposes but frequent exposure to it could cause harm to patients as well as doctors. In this study, how well a GMR sensor is applicable instead of an X-ray is investigated. The sensor's voltage output is experimentally fitted to distance with a relationship of 3rd degree polynomial. To detect a small magnetized tip with 900 Oe inside a human body, a 2×2 arrayed GMR sensor and a location estimation algorithm based on information acquired from four sensors is developed. Evaluation tests show that the suggested method is applicable to limited cases with a distance less than 33-55 mm, and the location of a magnet tip is estimated relatively well with an error less than 1.5 mm.

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