Patent ID: 6668651
Filing Date: 2003-12-30
Classification: F01D,F05D,G01H

Abstract:
A process for measuring vibration frequencies of portions of a spinning body by using detectors placed around the spinning body and in front of which the portions pass, by converting measurements of the detectors into frequency spectra, wherein the detectors are distributed in several networks having different, particularly mutually prime, numbers of detectors, a spectrum is obtained for each of the networks and in that comparisons of the spectra of the networks are made in order to select lines of the spectra and to consider as the vibration frequencies the frequencies of the lines selected, including a selection of the lines which are common to all the spectra, and including a comparison between a number of the lines which are common to all the spectra up to a frequency equal to Fr/2, where Fr is a frequency of rotation of the spinning body and ppcm (Ni) is a smallest common multiple of numbers Ni of the sensors of all the networks, and the numbers of lines present in each of the networks up to a frequency respectively equal to NiÂ·Fr/2.