A non-invasive thermal drift compensation technique applied to a spin-valve magnetoresistive current sensor

A non-invasive thermal drift compensation technique applied to a spin-valve magnetoresistive current sensor

A compensation method for the sensitivity drift of a magnetoresistive (MR) Wheatstone bridge current sensor is proposed. The technique was carried out by placing a ruthenium temperature sensor and the MR sensor to be compensated inside a generalized impedance converter circuit (GIC). No internal mod...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Vol. 11; no. 3; pp. 2447 - 2458
Main Authors: Sánchez Moreno, Jaime, Ramírez Muñoz, Diego, Cardoso, Susana, Casans Berga, Silvia, Navarro Antón, Asunción Edith, Peixeiro de Freitas, Paulo Jorge
Format: Journal Article
Language:English
Published: Switzerland MDPI AG 01-03-2011
Molecular Diversity Preservation International (MDPI)
Subjects:
Digital signal processors
Electric currents
Electric Impedance
electrical current measurement
Equipment Design
Magnetics - instrumentation
Magnetics - methods
magnetoresistance sensor
Power supply
Ruthenium - chemistry
Sensors
spin-valve sensor
Temperature
temperature compensation
electrical current measurement
temperature compensation
magnetoresistance sensor
spin-valve sensor
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Summary:A compensation method for the sensitivity drift of a magnetoresistive (MR) Wheatstone bridge current sensor is proposed. The technique was carried out by placing a ruthenium temperature sensor and the MR sensor to be compensated inside a generalized impedance converter circuit (GIC). No internal modification of the sensor bridge arms is required so that the circuit is capable of compensating practical industrial sensors. The method is based on the temperature modulation of the current supplied to the bridge, which improves previous solutions based on constant current compensation. Experimental results are shown using a microfabricated spin-valve MR current sensor. The temperature compensation has been solved in the interval from 0 °C to 70 °C measuring currents from -10 A to +10 A.
Bibliography:ObjectType-Article-1
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content type line 23
ISSN:1424-8220
1424-8220
DOI:10.3390/s110302447