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RESEARCH PRODUCT
A Non-Invasive Thermal Drift Compensation Technique Applied to a Spin-Valve Magnetoresistive Current Sensor
Diego Ramírez MuñozSilvia Casans BergaPaulo P. FreitasAsuncion Edith Navarro AntonSusana CardosoJaime Sánchez Morenosubject
EngineeringWheatstone bridgeSpin valvemagnetoresistance sensorlcsh:Chemical technologyBiochemistryArticleRutheniumtemperature compensationAnalytical ChemistryCompensation (engineering)law.inventionMagneticslawelectrical current measurementElectric Impedancelcsh:TP1-1185Current sensorElectrical and Electronic Engineeringspin-valve sensorInstrumentationbusiness.industryTemperatureElectrical engineeringEquipment DesignAtomic and Molecular Physics and OpticsOptoelectronicsConstant currentCurrent (fluid)businessFiber optic current sensorSensitivity (electronics)description
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2011-02-01 | Sensors |