Z axis tracker

A - Human Necessities – 61 – F

Patent

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Details

A61F 9/007 (2006.01) A61F 9/01 (2006.01) A61N 5/06 (2006.01) G01S 17/08 (2006.01) G01S 17/66 (2006.01) G01S 17/88 (2006.01) A61B 3/113 (2006.01) A61B 17/00 (2006.01) A61F 9/008 (2006.01) A61F 9/011 (2006.01)

Patent

CA 2334825

A method of tracking the position of an object surface (12) includes generating an interference signal between light beams of short temporal coherence length respectively comprising a primary beam (10) reflected or scattered from the object surface (12) and a reference beam (8). A reference surface (14) in the path of said reference beam (8) is scanned about a position at which the interference signal is generated, which position is thereby indicative of the position of the object surface (12). In one aspect, the position of the reference surface (14) is controlled (16, 18) to maintain a predetermined point in the range of the scanning at the indicative position.

L'invention concerne un procédé de poursuite de la position de la surface (12) d'un objet, consistant à générer un signal d'interférence entre des faisceaux lumineux à longueur de cohérence temporelle courte comprenant respectivement un faisceau primaire (10) réfléchi ou diffusé par la surface (12) de l'objet, et un faisceau (8) de référence. Une surface (14) de référence disposée dans le trajet du faisceau (8) de référence est soumise à balayage autour d'une position au niveau de laquelle le signal d'interférence est généré, laquelle position est donc significative de la position de la surface (12) de l'objet. Selon un aspect de l'invention, la position de la surface (14) de référence est commandée (16, 18) de manière à maintenir un point prédéterminé dans la plage du balayage au niveau de la position indicative.

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