DocumentCode :
2620521
Title :
Time domain and statistical modeling of the Barkhausen effect used as a magnetic sensor
Author :
Anderson, Theodore R.
Author_Institution :
Naval Undersea Warfare Center, Newport, RI, USA
Volume :
1
fYear :
1998
fDate :
24-28 Aug 1998
Firstpage :
361
Abstract :
This research presents a time domain model of the Barkhausen effect as a magnetic field sensor. This type of magnetic field sensor will supplement magnetic field sensors already in use and should have wide applicability in the EMC community. When a silicon steel sheet is placed at the center of a coil, an external magnetic field from a moving magnet will cause the magnetic domain walls to snap and click as they suddenly orient themselves. This sudden orientation of the magnetic domains causes sudden changes in magnetization which produce impulses of EMF which can be heard as distinct clicks on a loudspeaker connected to an amplifier and with the amplifier connected to the coil. This sudden orientation of the magnetic domain walls in the presence of an external magnetic field is called the Barkhausen effect. In this paper a time domain model of the Barkhausen effect as a magnetic sensor is presented. Equations are also developed which model the Barkhausen effect as a motion sensor by sensing magnetic fields in a moving reference frame modeled. The sudden orientation of the magnetic domain described by the Barkhausen effect is mathematically modeled by calculating the energy needed to change the direction of the Bloch wall or the transition layer that separates adjacent domains magnetized in different directions. The spectrum of the Barkhausen effect was theoretically derived
Keywords :
Barkhausen effect; coils; magnetic domain walls; magnetic field measurement; magnetic sensors; time-domain analysis; Barkhausen effect; Bloch wall direction change; EMC; EMF impulses; adjacent magnetised domains; coil; external magnetic field; magnetic domain walls; magnetic sensor; magnetization; motion sensor; silicon steel sheet; statistical modeling; sudden magnetic domains orientation; time domain model; time domain modeling; Coils; Electromagnetic compatibility; Magnetic domain walls; Magnetic domains; Magnetic fields; Magnetic sensors; Magnetic separation; Magnetization; Silicon; Steel;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electromagnetic Compatibility, 1998. 1998 IEEE International Symposium on
Conference_Location :
Denver, CO
Print_ISBN :
0-7803-5015-4
Type :
conf
DOI :
10.1109/ISEMC.1998.750117
Filename :
750117
Link To Document :
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