Fundamental mode orthogonal fluxgate gradiometer

Ichiro Sasada, Shoumu Harada

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

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
Volume50
Issue number11
DOIs
Publication statusPublished - Nov 1 2014

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Sensors
Magnetometers
Bias currents
Pickups
Electronic equipment
Tuning
Magnetic fields
Networks (circuits)

All Science Journal Classification (ASJC) codes

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

Cite this

Fundamental mode orthogonal fluxgate gradiometer. / Sasada, Ichiro; Harada, Shoumu.

In: IEEE Transactions on Magnetics, Vol. 50, No. 11, 6971614, 01.11.2014.

Research output: Contribution to journalArticle

Sasada, Ichiro ; Harada, Shoumu. / Fundamental mode orthogonal fluxgate gradiometer. In: IEEE Transactions on Magnetics. 2014 ; Vol. 50, No. 11.
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