Magnetic sensors interact with magnetic fields from electromagnets, solenoids and permanent magnets. They do not require any physical contact making them potentially highly reliable with long lifecycle due to no wear contactless position sensing. Magnetic sensors can work through most non-magnetic barriers (materials capable of having eddy currents would have limitations e.g. aluminium, copper).
Some of the magnetic sensors have a voltage induced in them e.g. Hall Effect devices in Gaussmeters the voltage is proportional to the magnitude of the applied magnetic field from the magnet. The magnitude of the applied magnetic field from the magnet is a function of the magnet size and shape and the magnetic material used (magnet type, magnet grade, temperature of the magnet).
Magnetic field sensors are used to give information relating to speed, position, movement, rotational angle, etc.
Magnetic field sensors include:-
Hall Effect Devices
Giant Magneto Resistive Devices (GMR)
Variable Reluctance Devices (VR)
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