Hall sensors are available in a wide variety of shapes and sizes
For adaptability of shapes and sizes for adaptability to many
different applications. The two basic types are transverse and
axial, as illustrated in Figure 4.
The transverse type is useful where the field must be measured in
thin gaps and for multiplier applications. The axial type must be
used where the field is parallel to the axis of a hole, such as in
traveling wave tubes or solenoids. Standard transverse probes as
thin as .006" and axial probes as small as .063" in diameter are
available. Bulk-material Hall plates may be sandwiched between
ferrite pieces to obtain effective air gaps less than .003". This may
be useful in applications requiring maximum magnetic efficiency,
such as electronic compasses and proximity sensors. For a Hall
sensor to accurately measure flux density, the Hall plate area
should be smaller than the cross section of the field to be measured.
The output voltage is proportional to flux density, but a Hall plate is
not equally sensitive over its entire area. If a high resolution is
important, the Hall plate area should be small. Active areas as
small 0.010” are available, while even smaller ones have been made.
Source ( pdf )
http://www.physics.brown.edu/physics/demopages/Demo/
thin gaps and for multiplier applications. The axial type must be
used where the field is parallel to the axis of a hole, such as in
traveling wave tubes or solenoids. Standard transverse probes as
thin as .006" and axial probes as small as .063" in diameter are
available. Bulk-material Hall plates may be sandwiched between
ferrite pieces to obtain effective air gaps less than .003". This may
be useful in applications requiring maximum magnetic efficiency,
such as electronic compasses and proximity sensors. For a Hall
sensor to accurately measure flux density, the Hall plate area
should be smaller than the cross section of the field to be measured.
The output voltage is proportional to flux density, but a Hall plate is
not equally sensitive over its entire area. If a high resolution is
important, the Hall plate area should be small. Active areas as
small 0.010” are available, while even smaller ones have been made.
Source ( pdf )
http://www.physics.brown.edu/physics/demopages/Demo/
em/demo/halleffect.pdf/
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