Abstract
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.
Highlights
Advances in the solid-state sensor manufacturing industries have allowed a significant improvement in the miniaturization, consumption and cost of instrumentation and measurement systems
The temperature dependence of their physical properties demands the use of specific compensation techniques, especially where the measurand of interest will not be the temperature
A MR electrical current sensor is compensated with a ruthenium based temperature sensor
Summary
Advances in the solid-state sensor manufacturing industries have allowed a significant improvement in the miniaturization, consumption and cost of instrumentation and measurement systems. Digital processing algorithms have been applied reducing the thermal dependence in piezoresistive sensors [6], load cells [7] or in pressure capacitive sensors [8] These techniques require an additional processing hardware based in digital intelligence (computer, microcontroller or digital signal processor) and dedicated software. In this work the thermal drift of a microfabricated current sensor is reduced by the use of a simple hardware compensation method. This represents an improvement of a technique that was first developed in [9]. In the present work the temperature compensation has been solved in the temperature interval from 0 °C to 70 °C measuring currents from −10 A to +10 A
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