Patent ID: 7956622
Filing Date: 2011-06-07
Classification: G01D

Abstract:
1. A method for the signal processing of capacitive measurement scales, comprising: measuring a plurality of lengths or angles between two parts of the capacitive measurement scales, the two parts moving relative to each other, each of the two parts provided with electrodes that together form condensers, the magnitudes of which are variable and depend on the relative position as specified by a sinusoidal relationship between the two parts moving relative to each other, wherein the first part has n electrodes evenly distributed over one mechanical measurement period and the second part has one electrode per mechanical measurement period, and that the electrodes in the first part are supplied with n alternating input voltages of the same frequency and the same amplitude, wherein the time differences of the said alternating voltages relative to each other are t measuring the amplitude of each of the n signals in the electrodes of said second movable part; and storing separately the value for each of the n signals, wherein the relative position (x