Hall effect sensors can report distances to a magnetic field by measuring its output. They are used mostly in automotive applications. For instance, if you place two magnets inside a wheel with your hall effect sensor, it can measure the speed that the magnets travel as the wheel spins, by determining the distance of the magnets from the sensor at various points. This helps measure revolutions of your tires, and can interpret that into speed. There are various functions in your car that can benefit from this type of data. Of all magnetic sensors, this one is one of the more common.
stronger. These have similar applications to hall effect sensors, but the VR type is generally less expensive due to extra components that it needs to function. VR sensors are also great for high temperatures, though, and they do not need an external source of power.
Magnets can communicate all kinds of information, including speed and distance relative to other objects. In order to accurately report this kind of data, magnetic sensors need to be chosen carefully to
fit the right application. Sensor Solutions has a selection tool on their website that will help you choose and design the right sensor to fit your needs.