The Possibility of Train Speed and Position Detection of Magneto-Resistance Elements

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  • 磁気抵抗素子回転検出センサによる列車速度・位置検出の可能性
  • ジキ テイコウ ソシ カイテン ケンシュツ センサ ニ ヨル レッシャ ソクド イチ ケンシュツ ノ カノウセイ

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Using Sn-doped single crystal InSb thin films of 1.0μm thickness grown on GaAs substrates by molecular beam epitaxy (MBE), we developed magneto-resistance (MR) elements with very small temperature dependence. These MR elements were used to form a rotation detection sensor combined with a bias magnet. The sensor can achieve the stable contactless detection of rotating gear teeth over a wide range of rotation speeds and a wide range of temperatures -20 to 140°C. The possibility of the angular detection of the rolling railway wheel by the sensor was discussed.

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