The magnetic field sensors.
Magnetic field sensors based on various magnetic effects and is designed to accurately measure the speed, rotation angle, position, movement and rotation of the different moving objects; for precise measurement of voltage, resistance, power, etc. characteristics of the current and the magnetic field; for use as non-contact switches and magnetic compasses.
Magnetic field sensors are included in the elemental basis of electronic equipment and its operation is based on different magnetic effects.
They are designed to accurately measure the speed, rotation angle, position, movement and rotation of the different moving objects; for the accurate measurement of voltage, resistance, strength and other characteristics of the current and the magnetic field; for use as non-contact switches and magnetic compasses.
There are different types of sensors that use different physical processes – the effects of magnetism such as Hall effect, magnetoresistance effect (the effect of the anisotropic magnetoresistance AMR effect, a giant magnetoresistance – GMR), the effect of induced induction, the effect of the tunneling magnetic resistance (TMR) and others. Each effect and, accordingly, the sensor has its pros and cons.
Regardless of type, all sensors perform similar functions – convert the energy of magnetic field into electric energy and provide information in the form of changes in output voltage or resistance sensor.
Magnetic field sensors find their application in automotive industry, aircraft industry, robotics, consumer and industrial electronics, machine tool etc. industries.
Magnetic field sensors are available in the form of Autonomous components and modules either in multi-sensor combinations.
Hall sensors – magnetic sensors based on Hall effect. Hall sensors are most common and constitute about 70% of all the manufactured magnetic sensors.
The Hall effect named after its discoverer – Edwin Hall who discovered this effect in 1879. The essence of the effect consists in the appearance of a transverse potential difference (called the hall voltage) by placing a conductor with a constant current in a magnetic field.
The Hall sensor is designed to simplify any design with the function switch and increase its reliability. As contactless switches, Hall effect sensors, unlike mechanical switches have small body sizes, low power consumption, high reliability and long service life.
The popularity of sensors Hall due to the following factors:
the Hall effect is not affected by dust, dirt, interference, temperature and temperature changes,
they provide a high degree of repeatability of measurement of the magnetic field.
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