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Sensors 2017, 17(5), 1103; doi:10.3390/s17051103

Operating Point Self-Regulator for Giant Magneto-Impedance Magnetic Sensor

College of Mechatronics Engineering and Automation, National University of Defense Technology, Changsha 410073, China
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Author to whom correspondence should be addressed.
Academic Editors: Ashutosh Tiwari and Bharati Tudu
Received: 14 March 2017 / Revised: 14 April 2017 / Accepted: 9 May 2017 / Published: 11 May 2017
(This article belongs to the Special Issue Magnetic Sensors and Their Applications)
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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. View Full-Text
Keywords: GMI sensor; feedback control; compensation network; bias magnetic field GMI sensor; feedback control; compensation network; bias magnetic field
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Zhou, H.; Pan, Z.; Zhang, D. Operating Point Self-Regulator for Giant Magneto-Impedance Magnetic Sensor. Sensors 2017, 17, 1103.

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