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Magnetiske og induktive sensorer

Måle med: Spole Luftkjerne Ferromagnetisk kjerne Hall sensor Magneto resistiv sensor AMR GMR (CMR) Fluxgate sensor SQUID. Hva kan vi måle: AC felt DC felt Ferromagnetiske materialer Ledende materialer Ekstrautstyr: Magnet Eksitasjons spole. Magnetiske og induktive sensorer.

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Magnetiske og induktive sensorer

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  1. Måle med: Spole Luftkjerne Ferromagnetisk kjerne Hall sensor Magneto resistiv sensor AMR GMR (CMR) Fluxgate sensor SQUID Hva kan vi måle: AC felt DC felt Ferromagnetiske materialer Ledende materialer Ekstrautstyr: Magnet Eksitasjons spole Magnetiske og induktive sensorer

  2. Hall effect (3.8)

  3. I=Nqv B ÷ + ÷ + ÷ fE fM ÷ ÷ + qv ÷ + E x x x x x x x x b V Gedanken experiment B v fM ÷ qv Hall coefficient Geometry

  4. Characteristics ~108 Tesla 100 Tesla Tesla (126 μT) typisk 50 μT 10-14 Tesla Gauss = 100 μTesla tilsvarer ca 80 A/m To akse melexis hall sensor

  5. x x x x x x x x Material characterization Hall coefficient I I B B v fM fM ÷ + qv qv v Polarity of induced voltage can be used to determine the polarity of majority carriers

  6. B Feltforsterkning av dipoler

  7. Permanent magnet - Hall sensor

  8. 3 ”effekter”: Anisotropic magneto resistive (AMR) Giant magneto resistive (GMR) Colossal magneto resistive AMR sensor: Magneto resistive sensorer (MRS) Honeywell: Application Note – AN218 Vehicle Detection Using AMR Sensors

  9. 3-akse AMR kompass I2C: Inter IC (Buss) Honeywell :3-Axis Digital Compass IC HMC5843

  10. Vehicle detection Earths magnetic field Honeywell: Application Note – AN218 Vehicle Detection Using AMR Sensors

  11. Permanent field 1

  12. Permanent field 2

  13. Eddy current sensor

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