Optical translation of triangulation position measurement

G - Physics – 01 – B

Patent

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Details

G01B 11/06 (2006.01) D21F 7/06 (2006.01) G01C 3/10 (2006.01) G01S 17/48 (2006.01)

Patent

CA 2635864

An optical translation technique for moving the interrogation spot at which a triangulation system measures the displacement of a target is disclosed. In normal operation of the laser triangulation sensor, an incident laser beam is projected from a sensor head onto a surface of a web that is facing the sensor head. Radiation is reflected from the surface and detected by the sensor. The distance from the sensor head to the web surface is calculated by triangulation. With optical translation, both the incident ray path and the captured ray path are translated with a plurality of high refractive index geometries such that the nominal functioning of the triangulation sensor remains undisturbed. The optimal position on the sheet wherein the interrogation spot will be located can be ascertained.

L'invention porte sur un procédé de translation optique qui permet de déplacer le point d'interrogation par lequel un système de triangulation mesure le déplacement d'une cible. Lors du fonctionnement normal du capteur de triangulation laser, un faisceau laser incident est projeté depuis une tête de capteur sur la surface d'une bande située en face de la tête de capteur. Le rayonnement est réfléchi par la surface et détecté par le capteur. La distance qui séparer la tête de capteur de la surface de la bande est calculée par triangulation. Avec la translation optique, tant la trajectoire du rayonnement incident que la trajectoire du rayonnement capturé sont soumises à une translation selon une pluralité de géométries d'indices de réfraction élevés de sorte que le fonctionnement nominal du capteur de triangulation reste inchangé.L'invention permet d'établir avec précision la position optimale sur la feuille où le point d'interrogation sera situé.

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