Low magnetic field detection/measurement
Référence
02585-01
Mots-clés
GMR, Giant magnetoresistance, Polarization, Magnetic, Field, Sensor
Statut des brevets
French patent application FR0951918, filed on March, 25th, 2009
Inventeurs
Claude CAVOIT
Statut commercial
Exclusive or non-exclusive licenses
Laboratoire
Laboratoire de Physique et Chimie de l’Environnement et de l’Espace (LPC2E) UMR 6115, France, http://lpce.cnrs-orleans.fr/
Description
CONTEXT
The measurement of low magnetic fields is very useful for the geophysics’ and metallurgical fields. Some techniques, such as the fluxgate or the GRM (Giant MagnetoResistance) already exist but they are still quite bulky or not very efficient. So, we decided to improve the performances of GMRs.
TECHNICAL DESCRIPTION
Our technique consists in a closed magnetic circuit in two parts. Each part is separate by two magnetoresistances and polarized.
BENEFITS
- Improvement of GMRs:
Lower bulk
Better resistance to background noise,
Better sensibility for the whole frequency range,
Lower temperature dependence,
Better performances alternative or direct magnetic fields,
Better offset,
Sensibility independent of magnetic polarization
INDUSTRIAL APPLICATIONS
Detection of a low magnetic field for:
Planets,
Geophysics’ drilling,
Geophysics’ prospection,
Non-destructive checking of metallic structures.
DEVELOPMENT STAGE
- Demonstrators available
On-going improvement
For further information, please contact us (Ref 02585-01)