Optical method of determining a physical attribute of a...

G - Physics – 01 – B

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G01B 11/04 (2006.01)

Patent

CA 2560092

A method for optically determining a physical attribute of a moving object, such as the height h of the carbons (14) of a pantograph head (10). This method incorporates a method for optically establishing a mathematical spatial relationship between one or more cameras (26) and one or more fanned lasers (24) each capable of projecting a laser beam along a laser plane (28). The method comprises: establishing an orientation and location of each camera (26) with respect to a co-ordinate system; establishing an orientation of each laser plane (28) within the co-ordinate system; and deriving a transformation function for calculating the three dimensional position of points within the plane (28) of each respective laser beam from a pixel location within a pixelated image created by each of the cameras.

L'invention concerne un procédé destiné à déterminer optiquement un attribut physique d'un objet mobile, notamment la hauteur <i>h</i> des carbones (14) d'une tête de pantographe (10). Ce procédé comprend un procédé destiné à établir optiquement une relation spatiale mathématique entre une ou plusieurs caméras (26) et un ou plusieurs lasers en éventail (24) chacun capable de projeter un faisceau laser le long d'un plan laser (28). Ce procédé consiste: à établir une orientation et un emplacement pour chaque caméra (26) par rapport à un système de coordonnées; à établir une orientation pour chaque plan laser (28) dans le système de coordonnées; et à dériver une fonction de transformation afin de calculer la position tridimensionnelle à l'intérieur du plan (28) pour chaque faisceau laser respectif à partir d'un emplacement de pixel à l'intérieur d'une image pixelisée crée par chacune des caméras.

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