Frequently Asked Questions
Does magnetic measurement work?
The magnetic measuring is proven a million times. There are numerous automotive applications such as speed measurement for anti-lock systems in which the principle proved itself daily.
What does the measuring distance depends on when measuring magnetically?
The bigger the pole length, the farther the distance measurement when measuring magnetic. A rule of thumb is that the measuring distance is typically half a pole length.
What is the difference between a measurement based on the Hall principle and the magnetoresistive effect?
There are different sensors used. Using Hall principle, a current is driven through a thin wafers. When the wafers is permeated by a magnetic flux that is perpendicular to the flow and flux density vector voltage present, which is proportional to the flux density. In magnetoresistive sensors other material properties are used. The resistance of a ferromagnetic conductor depends on the field strength vector in its interior. Certain types of materials for the pulse generators are required for MR sensors and it must be complied with certain geometries. AMR sensors are usually operated in saturation, which is why the signal depends only on the direction of the field.
Differ the standards for Hall and MR sensors?
The scales are suitable for both measurement principles.
Does the magnetic field of the scale deteriorate over time?
The magnetic field of a scale remains unchanged over time it. It can only be changed if a stronger magnetic field touches the scale nearly in contact.