Magnetic impedance sensor
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United States of America Patent
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Nov 6, 2018
Grant Date -
Sep 29, 2016
app pub date -
Mar 22, 2016
filing date -
Mar 26, 2015
priority date (Note) -
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Abstract
A magnetic impedance sensor comprises an amorphous wire 1 of a magneto-sensitive material as the magneto-impedance element, a pulse oscillator means 2 that alternately reverses and outputs a basic pulse current and a compensating pulse current with polarity opposite to the basic pulse current in predetermined periods, and a signal processing means 3 that converts an alternate current voltage generated in response to a magnetic field intensity around the amorphous wire by a magnetic impedance effect of the amorphous wire according to the pulse current into a magnetic signal voltage in response to the magnetic field intensity, and outputs the magnetic signal voltage. Since the amorphous wire 1 is repeatedly reversely magnetized in the u and v circumferential directions, due to compensating the negative pulse current, the magnetic sensor with excellent linear characteristics are obtained.
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