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    • 6. 发明公开
    • Magnetic field sensor
    • Magnetfeldfühler
    • EP0773449A3
    • 1998-11-25
    • EP96116894
    • 1996-10-21
    • JAPAN RES DEV CORP
    • MOHRI KANEO
    • G01R33/02G01R33/022H01F21/00
    • G01R33/022
    • A magnetic field sensor for gradient field detection (gradient type magnetic field sensor) cancels relatively uniform disturbance magnetic fields (background magnetic fields) such as the terrestrial field through the use of two magneto-impedance elements, thereby making it possible to detect only a signal magnetic field (gradient field) which is considerably localized spatially. The magnetic field sensor includes a pair of sensor heads (A) made of an amorphous wire (1), and a self-oscillation type electronic circuit (B) for detecting a spatially uniform magnetic field or a differential value of a spatially gradient magnetic field by switching the direction of a bias magnetic field applied to the pair of sensor heads (A).
    • 用于梯度场检测的磁场传感器(梯度型磁场传感器)通过使用两个磁阻抗元件来消除诸如地面场的相对均匀的干扰磁场(背景磁场),由此使得可以仅检测信号 磁场(梯度场),其在空间上显着地局部化。 磁场传感器包括由非晶线(1)制成的一对传感器头(A)和用于检测空间均匀磁场或空间梯度磁场的微分值的自激振荡型电子电路(B) 通过切换施加到一对传感器头(A)的偏置磁场的方向。