Working With Magnetic Fields
How Do They Work?
A magnetic field will convert electrical energy to
mechanical energy, attract ferromagnetic objects
and serves as an input for Hall-Effect Sensors. A
magnetic field is described in terms of flux. Flux
lines are imaginary lines of magnetic force, orig-
inating at the North pole of a magnet and ending
at the South pole of the magnet. These lines rep-
resent the physical force exerted by the magnet.
When these magnetic flux lines pass through a
plate of semiconductor material, electrons are
forced to one side of the plate resulting in a volt-
age potential. This phenomenon is known as the
Hall-Effect.
Flux density is measured in units of Gauss or
milliTesla. The intensity of the magnetic field depends on many variables, such as cross-sectional area, length,
shape, material and ambient temperature. Each one of these variables must be considered when designing the
Hall Effect sensor integrated circuit and magnetic system for your application. The following section is intend-
ed to explain some fundementals which are useful in Hall Sensor designs and applications.
Figure 9, Magnetic Spectrum
N
S
Figure 8, Flux Paths
Hall-Effect Sensors
Magnetoresister
Inductive Sensors
Giant Magnetoresister
Nuclear Magnetic Resonance
Fluxgate Magnetometer
Reed Switch
(Superconducting Quantum Interface Devices)
Ferrite Magnets
Alnico Magnets
Rare Earth Magnets (Neo, SmCo)
Ceramic Magnets
.000001
.001
.01
.1
1
10
100
1K
10K
100K
Gauss
10K
1K
100
10
1
.1
.01
.001
.0001
.0000001
milliTesla
Bio
Signals
Earth's
Field
Strongest
Electro
Magnet
Solar
Flares
SQUIDs
相关PDF资料
MX887DHTTR MICROPOWER HALL-EFFECT SWITCH
MX887PHTTR IC HALL EFFECT SW UPWR TSOT23-3
OMH3040S SENSOR HALLOGIC HALL EFFECT
OPB122B SWITCH SLOTTED OPTIC PHOTOLOGIC
OPB200 SENSR OPTO SLOT 5.1MM TRANS THRU
OPB202 SWITCH SLOTTED OPTICAL
OPB483T11 SWITCH PHOTOLOGIC SLOTTD OPTICAL
OPB660N SENS OPTO SLOT 3.18MM TRAS W/RES
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