Abstract
The giant magneto-impedance (GMI) magnetic sensor based on the amorphous wire has been believed to be tiny dimensions, high sensitivity, quick response, and small power consumption. This kind of sensor is usually working under a bias magnetic field that is called the sensor’s operating point. However, the changes in direction and intensity of the external magnetic field, or the changes in sensing direction and position of the sensor, will lead to fluctuations in operating point when the sensor is working without any magnetic shield. In this work, a GMI sensor based on the operating point self-regulator is designed to overcome the problem. The regulator is based on the compensated feedback control that can maintain the operating point of a GMI sensor in a uniform position. With the regulator, the GMI sensor exhibits a stable sensitivity regardless of the external magnetic field. In comparison with the former work, the developed operating point regulator can improve the accuracy and stability of the operating point and therefore decrease the noise and disturbances that are introduced into the GMI sensor by the previous self-regulation system.
Highlights
Micro magnetic sensors based on the amorphous wires have attracted much attention in the last decades [1,2]
The compensated regulator has a much longer settling time in comparison with the uncompensated regulator, but its step overshoot and steady-state error are much smaller than the uncompensated regulator
A giant magneto-impedance (GMI) magnetic sensor based on the operating point self-regulator is developed in this work
Summary
Micro magnetic sensors based on the amorphous wires have attracted much attention in the last decades [1,2] This kind of magnetic sensor is based on the giant magneto-impedance (GMI). Effect, which is a large change in the electrical impedance of soft magnetic materials upon the applied external magnetic field [3,4]. The changes in direction and intensity of the external magnetic field or the changes in sensing direction and position of the GMI sensor will influence the operating point. It may cause the fluctuation in sensitivity of the GMI sensor. To maintain the sensor operation at a stable operating point is very important in the design of a highly sensitivity GMI sensor
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