Racetrack fluxgate sensor core demagnetization factor

✍ Scribed by J. Kubík; P. Ripka

• Book ID: 104092434
• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 469 KB
• Volume: 143
• Category: Article
• ISSN: 0924-4247
• DOI: 10.1016/j.sna.2007.10.066

✦ Synopsis

The demagnetization factor of a fluxgate core plays an important role in the resulting sensor sensitivity and noise. The global (magnetometric) demagnetization factor of fluxgate sensor ring cores was evaluated using finite element modelling. This new method was verified using measured effective demagnetization factors for ring cores and subsequently used in the modelling of the global demagnetization factor of racetrack fluxgate cores. The results of modelling and measurements were compared and show a very close match. Based on modelling, an empirical formula is presented to quickly evaluate the fluxgate racetrack core global demagnetization factor based on core geometry and material permeability. Finally, the modelling, measurement and empirical estimation were compared showing a good agreement on five measured cores. The derived empirical formula can be easily utilized in designing the sensor racetrack core shape.