FLUXGATE SENSOR AND REAL OPERATING-MODE B-H CURVE

Antonín Platil - Pavel Ripka

   Classical ringcore (Aschenberger-Goubau) fluxgate sensor was constructed from nanocrystalline material (Vitroperm by VAC). The core materials are usually characterized in well-defined modes. Either static B-H loops are measured or dynamic loops are recorded with sinewave H or better sinewave B waveform as required by IEC standard. Unfortunately, neither of these represents well the real operating conditions in fluxgate core, especially when the fluxgate is tuned and excitation current peak value is opt imized by appropriate capacitor. Dynamic B-H loops can be recorded by digital acquisition and signal processing in real operating conditions.

Keywords: fluxgate sensor, tuned excitation, dynamic hysteresis loop, B-H curve

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