magnetiske og induktive sensorer
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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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
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Hall effect (3.8)
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Gedanken experiment
x x x xB
÷v
qvfM
x x x xB
÷qvfM
÷÷
÷÷÷
++
+
+
fE
E
E M ff
qEqvB
I=N
qv
BNq
IE
V
bBI
NqbbEV
1
HallcoefficientGeometry
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Characteristics
Gauss = 100 μTesla tilsvarer ca 80 A/m
To akse melexis hall sensor
~108 Tesla
(126 μT) typisk 50 μT Tesla
100 Tesla
10-14 Tesla
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Material characterization
BINqbV
1
Hallcoefficient
x x x xB
÷v
qvfM
x x x xB
+qv v
fM
I I
Polarity of induced voltage can be used to determine the polarity of majority carriers
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Feltforsterkning av dipoler
B
ildB r 0
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Permanent magnet - Hall sensor
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Magneto resistive sensorer (MRS)
3 ”effekter”:• Anisotropic magneto
resistive (AMR)• Giant magneto
resistive (GMR)• Colossal magneto
resistive
AMR sensor:
Honeywell: Application Note – AN218Vehicle Detection Using AMR Sensors
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3-akse AMR kompass
Honeywell :3-Axis Digital Compass ICHMC5843
I2 C:
Inte
r IC
(Bus
s)
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Vehicle detection
Honeywell: Application Note – AN218Vehicle Detection Using AMR Sensors
Earths magnetic field
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Permanent field 1
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Permanent field 2
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Eddy current sensor