Method for working out the angular position of a rotating element and device for carrying out such a method

The present invention concerns a method for working out the angular position of a rotating element which is mounted in a fixed frame, consisting in using at least one light source emitting a beam of light in the direction of a fixed sensor and using computing means for processing an output signal of...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: Gimkiewicz, Christiane, Masa, Peter
Format: Patent
Sprache:eng ; fre ; ger
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Beschreibung
Zusammenfassung:The present invention concerns a method for working out the angular position of a rotating element which is mounted in a fixed frame, consisting in using at least one light source emitting a beam of light in the direction of a fixed sensor and using computing means for processing an output signal of the sensor, characterized in that it consists in: - a) arranging the light source with respect to the rotating element and of the sensor in a way so as to induce an interaction between the beam of light and the sensor which depends on the angular position of the rotating shaft, - b) arranging on the path of the beam of light, in a fixed position with respect to the sensor, a perforated mask which presents a repetitive pattern of perforations, - c) detecting shadows generated by the mask on the sensor, - d) processing the output signal of the sensor for determining the position of the shadows on the sensor, - e) and computing the angular position of the rotating element by using the position of the shadows.