1-pT Noise Fluxgate Magnetometer for Geomagnetic Measurements and Unshielded Magnetocardiography

Michal Janosek; Mattia Butta; Michal Dressler; Elda Saunderson; David Novotny; Coenrad Fourie

doi:10.1109/tim.2019.2949205

1-pT Noise Fluxgate Magnetometer for Geomagnetic Measurements and Unshielded Magnetocardiography

IEEE Transactions on Instrumentation and Measurement ◽

10.1109/tim.2019.2949205 ◽

2020 ◽

Vol 69 (5) ◽

pp. 2552-2560

Author(s):

Michal Janosek ◽

Mattia Butta ◽

Michal Dressler ◽

Elda Saunderson ◽

David Novotny ◽

...

Keyword(s):

Fluxgate Magnetometer ◽

Geomagnetic Measurements

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TESTS OF CRYOGENIC SQUID FOR GEOMAGNETIC FIELD MEASUREMENTS

Geophysics ◽

10.1190/1.1440524 ◽

1975 ◽

Vol 40 (2) ◽

pp. 269-284 ◽

Cited By ~ 22

Author(s):

J. E. Zimmerman ◽

W. H. Campbell

Keyword(s):

Magnetic Field ◽

Geomagnetic Field ◽

Quantum Interference ◽

Field Tests ◽

Field Measurements ◽

Fluxgate Magnetometer ◽

Superconducting Quantum Interference Device ◽

Superconducting Quantum Interference ◽

Field Fluctuations ◽

Geomagnetic Measurements

A type of cryogenic SQUID (superconducting quantum interference device) magnetometer was designed for geomagnetic measurements. Field tests of the instrument including comparisons to observatory variometers, a rubidium magnetometer, an induction loop, and a fluxgate magnetometer showed the new cryogenic systems to be reliable, accurate, portable, and simple to operate. Directional measurements of natural magnetic field fluctuations as small as 0.0001 gamma with periods from 0.5 sec to several hours were demonstrated.

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1 pT-noise fluxgate magnetometer design and its performance in geomagnetic measurements

2019 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) ◽

10.1109/i2mtc.2019.8826956 ◽

2019 ◽

Cited By ~ 3

Author(s):

Michal Janosek ◽

Mattia Butta ◽

Michal Dressler ◽

Elda Saunderson ◽

David Novotny ◽

...

Keyword(s):

Fluxgate Magnetometer ◽

Geomagnetic Measurements

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A new method of fluxgate signal extraction

Information extraction and processing ◽

10.15407/vidbir2017.45.083 ◽

2017 ◽

Vol 2017 (45) ◽

pp. 83-89

Author(s):

A.A. Marusenkov ◽

Keyword(s):

High Frequency ◽

Second Harmonic ◽

Excitation Frequency ◽

Low Noise ◽

Measuring System ◽

Signal Extraction ◽

Fluxgate Magnetometer ◽

New Approach ◽

Average Value ◽

The Time Domain

Using dedicated high-frequency measuring system the distribution of the Barkhausen jumps intensity along a reversal magnetization cycle was investigated for low noise fluxgate sensors of various core shapes. It is shown that Barkhausen (reversal magnetization) noise intensity is strongly inhomogeneous during an excitation cycle. In the traditional second harmonic fluxgate magnetometers the signals are extracted in the frequency domain, as a result, some average value of reversal magnetization noises is contributed to the output signals. In order to fit better the noise shape and minimize its transfer to the magnetometer output the new approach for demodulating signals of these sensors is proposed. The new demodulating method is based on information extraction in the time domain taking into account the statistical properties of cyclic reversal magnetization noises. This approach yields considerable reduction of the fluxgate magnetometer noise in comparison with demodulation of the signal filtered at the second harmonic of the excitation frequency.

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