Patent ID: 8878530
Filing Date: 2014-11-04
Classification: G01D

Abstract:
1. A measuring method of contactless magnetic detection of relative movement along a trajectory between a main creation system for creating a main magnetic field and a measuring system sensitive to the direction of the magnetic field, the creation system creating a main magnetic field of direction that is variable at least in a plane and that is detected by the measuring system in order to determine the relative position along that trajectory, characterized in that it consists in subjecting the measuring system to a compensation magnetic field of direction that is fixed and opposite to the direction of the maximum main magnetic field measured by the measuring system and delivered uniquely by the main creation system, such that the measuring system is sensitive to a resultant magnetic field resulting from the combination of the main magnetic field and the compensation magnetic field, the direction of the resultant magnetic field being variable in continuous and monotonic manner, and determining the direction of the magnetic field by measuring the two mutually-orthogonal components of the resultant magnetic field varying respectively substantially as cosine and sine functions of the angle of the resultant magnetic field.