Magnetiske og induktive sensorer
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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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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


Hall effect 3 8

Hall effect (3.8)


Gedanken experiment

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


Characteristics

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


Material characterization

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


Feltforsterkning av dipoler

B

Feltforsterkning av dipoler


Permanent magnet hall sensor

Permanent magnet - Hall sensor


Magneto resistive sensorer mrs

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


3 akse amr kompass

3-akse AMR kompass

I2C: Inter IC

(Buss)

Honeywell :3-Axis Digital Compass IC

HMC5843


Vehicle detection

Vehicle detection

Earths magnetic field

Honeywell: Application Note – AN218

Vehicle Detection Using AMR Sensors


Permanent field 1

Permanent field 1


Permanent field 2

Permanent field 2


Eddy current sensor

Eddy current sensor


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