Optical sensor system for detecting the position of an object

G - Physics – 01 – S

Patent

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Details

G01S 7/481 (2006.01) G01S 17/42 (2006.01) G01S 17/93 (2006.01)

Patent

CA 2322419

The invention relates to a special light source which produces a horizontal strip of light. Said strip of light is reflected by objects in the vicinity of the sensor system and conducted to a photoelectric converter by a special imaging device. Said imaging device is configured in such a way that objects situated further away are represented as being somewhat further apart so that an ordinary objective with linear resolution can obtain better position resolution of objects situated further away from the sensor system over the entire imaging area. Advantageously, light-emitting diodes are provided on the optical axis of a cylindrical mirror as the light-emitting elements. The electrical signals emitted by the photoelectric converter are evaluated by an evaluation unit in relation to their position. Using triangulation, said evaluation unit then determines how far away the objects which reflected the light are situated.

L'invention concerne une source lumineuse spéciale produisant une bande lumineuse horizontale. Cette bande lumineuse est réfléchie par des objets situés dans l'environnement du système de détection et dirigée sur un convertisseur photoélectrique via un dispositif imageur spécial. Ce dispositif imageur permet de représenter encore plus éloignés des objets déjà plus éloignés afin d'obtenir par un objectif courant de résolution linéaire une meilleure résolution de la position des objets sur toute la surface image, ces objets étant encore plus loin du système de détection. On utilise avantageusement comme éléments émetteurs de lumière des diodes électroluminescentes placés sur l'axe optique d'un miroir cylindrique. Les signaux électriques cédés par le convertisseur photoélectrique sont exploités en termes de position par une unité d'évaluation qui détermine par triangulation la distance des objets qui ont réfléchi la lumière.

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