Fundamental mode orthogonal fluxgate gradiometer

Ichiro Sasada, Shoumu Harada

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


A new method based on the fundamental mode orthogonal fluxgate (FM-OFG) mechanism is proposed to build a gradiometer of flexible base line and a minimum set of electronics. A pair of thin sensor heads and an electronic circuit designed for a magnetometer can be used, in which pickup windings of a sensor head pair are connected in counter series to respond to the field gradient between two locations of the sensor heads. Furthermore, a fine tuning to get a good balance in sensitivity between two sensor heads can be made by adjusting a dc bias current to one of the sensor heads. Developed gradiometers show a high suppression performance to the uniform magnetic field, where the suppression ratio (gradiometer output)/(magnetometer output), reaches below 1/40 000 with the resolution of 100 pT/m/√Hz at 10 Hz.

Original languageEnglish
Article number6971614
JournalIEEE Transactions on Magnetics
Issue number11
Publication statusPublished - Nov 1 2014

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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