Design of a Novel Excitation Circuit for Low Perming Error Fluxgate

Zhi Jun Cui

doi:10.4028/www.scientific.net/AMR.748.859

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 748Design of a Novel Excitation Circuit for Low...

Design of a Novel Excitation Circuit for Low Perming Error Fluxgate

Abstract:

An effective method for low perming error of fluxgates is to enlarge the peak value of the excitation current, but large amplitude excitation will increase the power consumption. A narrow pulse excitation current with sufficient peak value can reduce perming error with low power consumption while increase the difficulty of the signal processing with low sensitivity. The perfected excitation waveform with high ratio of peak value to RMS value by careful excitation tuning is an efficient solution. This paper presents a novel circuit which can generate an excitation current waveform with high peak value and low RMS value for fluxgates. Different from the tuned excitation circuit, the proposed circuit is a combination of an integrator and a differentiator with the same squarewave input. The excitation signal is the sum of a triangle wave and a sharp narrow pulse signal. It is easy to adjust the peak value of the narrow pulses for perming error study and no careful tune adjusting is needed. Finally, in case of the fixed peak value of the narrow pulses, an improved excitation circuit with only two resistors, two capacitors and one amplifier is also presented in the paper. The experiment results show that 0.5nT perming error can be achieved for 10mT shock.

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Periodical:

Advanced Materials Research (Volume 748)

Pages:

859-863

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.748.859

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Cite this paper

Online since:

August 2013

Authors:

Zhi Jun Cui

Keywords:

Excitation Circuit, Fluxgate, Low Power Consumption, Magnetic Sensor, Perming Error

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