High-sensitivity giant magneto-inductive magnetometer characterization implemented with a low-frequency magnetic noise-reduction technique
作者： A. Boukhenoufa , C.P. Dolabdjian , D. Robbes
关键词: Magnetometer 、 Electronics 、 Low frequency 、 Amorphous solid 、 White noise 、 Electrical engineering 、 Slew rate 、 Giant magnetoresistance 、 Bandwidth (signal processing) 、 Physics 、 Optics
摘要: The Giant Magneto-Inductive (GMI) effect in amorphous magnetic and conducting wires is analyzed using the concepts words of electronics engineering to show way high-sensitivity GMI magnetometers may be designed. Starting from a simple modeling magneto-impedance, direct field-locked loop are discussed, together with implementation low-frequency noise-reduction technique that makes good use basic modulating method. It allows removal part 1/f noise magnetometer. unmodulated magnetometer characteristics following: bandwidth higher than 100 kHz white level lower 7 pT//spl radic/Hz above 40 KHz. Similarly, main auxiliary modulated as follows: 4.8 60 3 Hz. slew rate both cases limited by 5 mT/s. dynamic these about /spl plusmn/25 mu/T, which corresponds more 120 dB 1 Hz
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