Double Coil-Less Fluxgate in Bridge Configuration

In this paper, a new method for excitation of coil-less fluxgate is presented. The purpose of this method is to reduce the spurious component of the output voltage, allowing us to increase the amplification. The method is based on the employment of two coil-less fluxgates in a double bridge, which i...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2010-02, Vol.46 (2), p.532-535
Main Authors: Butta, M., Ripka, P., Navarrete, JoaquÍn PÉrez, Vazquez, M.
Format: Article
Language:English
Subjects:
Bridge
Bridge circuits
coil-less
Coiling
Coils
double
Electric potential
Employment
Excitation
fluxgate
Fluxgate magnetometers
Magnetic field measurement
Magnetic sensors
Magnetism
Materials science and technology
Micromagnetics
Optimization
orthogonal
pulse excitation
Sensor phenomena and characterization
Voltage
Wire
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Summary:In this paper, a new method for excitation of coil-less fluxgate is presented. The purpose of this method is to reduce the spurious component of the output voltage, allowing us to increase the amplification. The method is based on the employment of two coil-less fluxgates in a double bridge, which injects pulsing current in opposite direction in each wire. By taking the difference of the voltages on the two wires, we suppress the component of the voltages, which does not change under application of external measured field. The sensitive axes are in opposite direction, so the wire feels opposite field. As a result, we will obtain an output voltage with low peak value, including only the component of the voltage that changes when we apply external field. Finally, we propose an improved version of the double bridge to allow the employment of two sensing elements with difference characteristics. This is obtained by optimizing the suppression of the spurious voltages and, at the same time, setting independently chosen values of exciting current for each wire.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2009.2033339