Transcript Magnetic position sensor

Magnetoresistive
sensors
Invent at 1856
William Thompson
Lord Kelvin
Magnetoresistive sensors
All types
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Anisotropic Magnetoresistive (AMR)
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Giant Magnetoresistive (GMR)
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Colossal Magnetoresistance (CMR)
Magnetoresistive sensors
Theory of AMR
Magnetoresistive sensors
Theory of AMR
cos 
2
Barber Pole Bias
Magnetoresistive sensors
Theory of AMR
Magnetoresistive sensors
Operation of AMR
Magnetoresistive sensors
Operation of AMR (HMC1501)
Magnetoresistive sensors
Operation of AMR (HMC1501)
Magnetoresistive sensors
Operation of AMR (HMC1501)
Magnetoresistive sensors
Operation of AMR (HMC1512)
Magnetoresistive sensors
Operation of AMR (HMC1512)
Magnetoresistive sensors
Operation of AMR (HMC1512)
Magnetoresistive sensors
Operation of AMR (HMC1512)
Magnetoresistive sensors
Typical application
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Cylinder position sensing in pneumatic cylinders
Elevator sensor
Lid sensor for laptop computers
Position sensor for materials handling equipment
(lift trucks)
Blood analyzer
Magnetic encoders
Magnetoresistive sensors
Comparision of Hall effect & MR technologies
Magnetoresistive sensors
Giant Magnetoresistive (GMR)
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Observe at 1988
Magnetoresistivity > 70%
Magnetoresistive sensors
Giant Magnetoresistive (GMR) - Theory
Magnetoresistive sensors
Giant Magnetoresistive (GMR) - Application
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Proximity Detection
Displacement Sensing
Rotational Reference Detection
Colossal Magnetoresistive (CMR)
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Observe at 1988
Magnetoresistivity > 1000% ~ 10000000%
Magnetoresistive sensors
Comparison