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Design and Development of Magnetic Sensor Using a Soft Magnetic Amorphous Wire
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- Authors
- Jang-Yeol Kim, Kibeom Kim, Hyun Joon Lee, Woocheon Park, In-Kui Cho
- Issue Date
- 2019-11
- Citation
- 한국자기학회 학술 대회(동계) 2019, pp.193-193
- Publisher
- 한국자기학회
- Language
- English
- Type
- Conference Paper
- Abstract
- Magnetic sensors are the devices that the existence of magnetic field by measuring the absolute value or relative change of the magnitude and the direction of the magnetic field intensity. Nowadays magnetic field sensors are used widely in industry, military, medical treatment, space research, geology, etc [1]. The trend of magnetic sensor development is towards smaller, faster, cheaper, more sensitive and reliable. Among many magnetic sensors, our research group is conducting research to develop the gaint magneto-impedance (GMI) sensor [2,3] and the fluxgate sensor [4,5] for underground or underwater magnetic field communication applications. The proposed GMI sensor has the same structure as fundamental mode-orthogonal fluxgate (FM-OFG) sensor. We are currently conducting research to confirm to possibility of magnetic field communication between GMI sensor and FM-OFG sensor. In this work, we present an off-diagonal GMI sensor and its results for realizing high sensitivity magnetic sensor at receiver unit for magnetic field communication. The GMI sensor is fabricated the soft magnetic material composed Co-Fe-Si-B amorphous ferromagnetic wire of 100μm diameter and the length of 30mm. The solenoid-shaped pickup coil with 250 turns of cu wire with the diameter of 0.1mm was wound around the alumina insulation tube. The amorphous wire was inserted the alumina tube and then it was embedded in PCB substrate. The hysteresis curve experimental result of GMI sensor using the Helmholtz coil at 20MHz showed that the same characteristics as hysteresis curve of soft magnetic material with narrow coercivity of 0.046Oe. The maximum responsivity of GMI sensor was 8.53kV/T of linear range ±100μT with the experimental condition of 20MHz and the excitation AC voltage of 5.5V pp and DC bias of -2.0V dc . We confirmed the applicability of the GMI sensor for magnetic field communication through the experimental results. Detailed results of the proposed GMI sensor will be presented for a discussion.
- KSP Keywords
- AC voltage, Absolute value, Alumina tube, Amorphous wire, Co-Fe, Cu wire, Experimental Result, Fe-Si, Fundamental mode, GMI sensor, Helmholtz coil