Single-board low-noise fluxgate magnetometer

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Low-noise fluxgate magnetometers are normally comprised of three separate devices: a power supply, the sensor head/electronics and an analog-to-digital converter (ADC). This paper presents a parallel rod fluxgate magnetometer in a single printed circuit board of size = 5 × 12 cm, weight = 45 g, and sensor head average power dissipation = 40mW. The open-loop noise spectral density = 5 pTrms= √Hz p @1 Hz, competitive with state-of-the-art devices. This is realized using a new amorphous wire core material and programmable mixed-signal electronics with low amplifier and ADC noise. We have compared the sensor performance to a low-noise observatory magnetometer and found sub-nT correlation when tracking the Y (East-West) component of the Earth's geomagnetic field.

Original languageEnglish
Article number034501
Number of pages6
JournalJournal of Applied Physics
Issue number3
Early online date17 Jan 2024
Publication statusPublished - 21 Jan 2024


  • magnetometer
  • geophysics
  • analog-to-digital converter
  • magnetic field sensors
  • anthropogenic
  • signal processing


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