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Hall Effect Sensor Working Principle Animation

 A Hall effect sensor is a transducer that varies its output voltage in response to a magnetic field. Hall effect sensors are used for proximity switching, positioning, speed detection, and current sensing applications.


Fig : A wheel containing two magnets passing by a Hall effect sensor

In its simplest form, the sensor operates as an analog transducer, directly returning a voltage. With a known magnetic field, its distance from the Hall plate can be determined. Using groups of sensors, the relative position of the magnet can be deduced.

Frequently, a Hall sensor is combined with circuitry that allows the device to act in a digital (on/off) mode, and may be called a switch in this configuration.

WORKING PRINCIPLE

A Hall probe contains an indium compound semiconductor crystal such as indium antimonide, mounted on an aluminum backing plate, and encapsulated in the probe head.

When the Hall probe is held so that the magnetic field lines are passing at right angles through the sensor of the probe, the sensor gives a reading of the value of magnetic flux density (B). A current is passed through the crystal which, when placed in a magnetic field has a “Hall effect” voltage developed across it. The Hall effect is seen when a conductor is passed through a uniform magnetic field. The hall effect voltage produced is an indication of magnetic object passed around it. Hence the Hall effect voltage is the signal output and used to sense an object near it.


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  1. DEXTER MAGNETIC TECHNOLOGIESJune 29, 2021 at 5:13 AM

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    Magnet manufacturer

    ReplyDelete
  2. John ClarkJuly 4, 2021 at 12:13 AM

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