OPTICAL DEVICE FOR MEASURING DISPLACEMENT VELOCITY OF A FIRST MOVABLE ELEMENT WITH RESPECT TO A SECOND ELEMENT

摘要

The invention relates to an optical device (1) for measuring the displacement velocity of a first movable element in relation to a second element which is fixed to one of said elements and comprises two lasers (2a, 2b) transmitting two incident beams (3a, 3b) towards the other element. The inventive device (1) comprises photosensitive linear arrays for front (9) and rear (10) detection which are substentially perpendicular to each other. Additional front (12) and rear (13) photosensitive linear arrays are disposed at a distance from the photosensitive front (9) and rear (10) linear arrays. A processing circuit (11) is connected to the photosensitive linear arrays (9, 10, 12, 13) and determines the longitudinal and/or transversal displacement velocity of the movable element. Said circuit also determines the distance between the device (1) and the other element by means of optical triangulation and corrects the longitudinal and/or transversal displacement velocity value according of said distance.