Highly Linear and Low Noise AMR Sensor Using Closed Loop and Signal-Chopped Architecture
During the last few decades, the continuously increasing demand for accurate and reliable magnetic measurements has paved the way for the development of different types of magnetic sensing systems as well as different measurement techniques. Sensor sensitivity and linearity, signal-to-noise ratio, measurement range, cross-talk between sensors in multi-sensor applications are only some of the aspects that have been examined in the past. In this paper, a fully analog closed loop system in order to optimize the performance of AMR sensors has been developed. The operation of the proposed system has been tested using a Helmholtz coil calibration setup in order to control both the amplitude and direction of magnetic field in the vicinity of the AMR sensor. Experimental testing indicated that improved linearity of sensor response, as well as low noise levels can be achieved, when the system is employed.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1131677Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 861
 P. Ripka, Magnetic Sensors and Magnetometers. Artech House Publishers, 2001.
 F. Paixao, C. Quini, O. Baffa, J. Miranda, “A novel device with 36 channels for imaging and signal acquisition of the gastrointestinal tract based on AC biosusceptometry”, 2010 Annual International Conference of the IEEE Engineering in Medicine and Biology, Buenos Aires, 2010, pp. 6457-6460.
 S. S. Ibanez et al., “A Front-End ASIC for a 3-D Magnetometer for Space Applications by Using Anisotropic Magnetoresistors”, IEEE Transactions on Magnetics, vol. 51, pp. 1-4, January 2015.
 S. Leittner et al., “Design of the Magnetoresistive Magnetometer for ESA’s SOSMAG Project”, IEEE Transactions on Magnetics, vol. 51, pp. 1-4, January 2015.
 M. Janosek, J. Vyhnanek and P. Ripka, “CW Metal Detector Based on AMR Sensor Array”, Sensors, 2011 IEEE, Limerick, 2011, pp. 1515-1517.
 J. Chen, L. Yu, C. Zuo, X. Chen, S. Wu, X. Yang, “Compensation Method of Cross-axis Effect for AMR Sensor”, Electrical and Control Engineering (ICECE), 2010 International Conference on, Wuhan, 2010, pp. 603-606.
 K. Mohamadabadi, C. Coillot, M. Hillion, “New Compensation Method for Cross-Axis Effect for Three-Axis AMR Sensors”, IEEE Sensors Journal, vol. 13, no. 4, pp. 1355-1362, April 2013.
 L. Yu et al., "Error Compensation and Implementation of Embedded High-Precision Magnetometer", Electrical and Control Engineering (ICECE), 2010 International Conference on, Wuhan, 2010, pp. 911-914.
 Datasheet 1- and 2-Axis Magnetic Sensors HMC 1001/1002/1021/1022, https://aerospace.honeywell.com/en/~/media/aerospace/files/datasheet/1and2axismagneticsensorshmc1001-1002-1021-1022_ds.pdf, April 2017.