Patent ID: 7598735
Filing Date: 2009-10-06
Classification: G01D

Abstract:
1. A device to detect at least the position of a mobile target equipped with at least one pattern and mounted so as to define a magnetic gap in which are placed at boot two probes that are sensitive to intensity of a physical magnitude where, for each passage of a pattern in front of the at least two probes, movement of the target causes a variation in the intensity of the physical magnitude detected by the at least two probes, the at least two probes deliver at least two electrical output signals that are a function of the amplitude of the physical magnitude, and are applied to an input of processing resources, wherein the processing resources include: resources to produce an offset value of; resources for the determination of a first signal known as an absolute signal Sa, obtained from at least one of the at least two output signals; wherein the absolute signal takes the following form: where n resources for the determination of a second signal, known as a differential signal, obtained from a difference between the at least two output signals; and resources for comparison between the absolute signal and the differential signal, the comparison delivering a binary signal representing at least the position of the mobile target.