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在控制领域中,常常需要将运动部分的速度和加速度作为电信号输出,以便实现对高速运行的机器的控制。如果采用磁阻元件差动传感器,则可无接触地,而且无磨损地测出这些量。这种测量是利用涡流原理进行的。根据在磁场运动的导电板内产生的涡电流,偏置磁场内产生偏转(参看图1)。磁场的偏转用1～2个差动传感元件拾取,无延迟地变换成与速度成比例的电信号,对它微分,即可得到加速度。
In the field of control, it is often necessary to output the velocity and acceleration of the moving parts as electrical signals in order to achieve control of the machine running at high speed. If a magnetoresistive element differential sensor is used, these quantities can be measured contactlessly and without wear. This measurement is made using the eddy current principle. According to the eddy currents generated in the conductive plates that move in the magnetic field, deflection occurs in the bias magnetic field (see FIG. 1). The deflection of the magnetic field is picked up by one or two differential sensing elements, transformed into an electrical signal proportional to the velocity without delay, and differentiated to obtain the acceleration.