Dual-core fluxgate gradiometer with gradient feedback

Author

Janosek, Michal ; Platil, Antonin ; Vyhnanek, Jan ; Brinek, Jan

Author_Institution

Dept. of Meas., Czech Tech. Univ. in Prague, Prague, Czech Republic

fYear

2013

fDate

3-6 Nov. 2013

Firstpage

1

Lastpage

3

Abstract

A fluxgate magnetic gradiometer with two fluxgate sensors and gradient feedback loop is presented. The two feedback coils, gradient and homogeneous, are common to both fluxgate sensors. The signal from the two sensors acts as regulating input in the two feedback loops, improving stability of the gradiometer. The presented gradiometer overcomes the problems of state-of-the art gradiometers which do not allow to decrease the sensor spacing. Because the information about homogeneous field is also available at the gradiometer output, it is possible to astatize the gradiometer. The presented gradiometer has a gradient base of 20-mm with overall sensor head size of 10-cm only and its noise is less than 1.1 nT/√Hz @ 1 Hz.

Keywords

fluxgate magnetometers; magnetic sensors; dual-core fluxgate gradiometer; feedback coils; fluxgate magnetic gradiometer; fluxgate sensors; frequency 1 Hz; gradient feedback; gradiometer stability; size 10 cm; Coils; Magnetic field measurement; Magnetic heads; Magnetic sensors; Noise; Vectors;

fLanguage

English

Publisher

ieee

Conference_Titel

SENSORS, 2013 IEEE

Conference_Location

Baltimore, MD

ISSN

1930-0395

Type

conf

DOI

10.1109/ICSENS.2013.6688287

Filename

6688287