Load Matching for Giant Magnetoimpedance Sensor in Coaxial Configuration

Abstract:

Operation on the principle of the giant magnetoimpedace (GMI) magnetic field sensor was designed and tested for the case of CoFeSiB amorphous wire of 6 mm length. We considered magnetic field displacement of the order of 10 Oe. Piece of amorphous wire was placed as a central conductor of a coaxial cable. The maximum slope of the sensor GMI characteristic was observed at the terminator resistance R_T = 50 Ohm, while the maximum of the GMI ratio variation was observed in the not “matched” (R_T = 75 Ohm) but closer to the “short” mode. Amorphous wire placed as a central conductor of a coaxial cable serves as a sensitive element with high sensitivity with respect to applied field making possible to use a simple design with a miniature coil for magnetic field biasing.

• Periodical: Key Engineering Materials (Volume 826)
• Pages: 19-24
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.826.19
• Online since: October 2019
• Authors: Sergei V. Shcherbinin, Stanislav O. Volchkov, Anna A. Chlenova*, Galina V. Kurlyandskaya
• Keywords: Coaxial Line, Giant Magnetoimpedance, Magnetic Field Sensor, Magnetic Wire

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