Patent ID: 7345745
Filing Date: 2008-03-18
Classification: G01P,G01S

Abstract:
1. An optical measuring device for measuring the displacement velocity of a first moving element with respect to a second element, said first moving element moving in a displacement plane substantially parallel to the second element, the optical measuring device being fixed to one of the two elements and comprising: means for emitting at least one incident light beam in the direction of the other element, means for receiving the light scattered by the other element, comprising front and rear detection means arranged substantially perpendicularly to one another, as well as an additional detection means, processing means, connected to the front and rear detection means and comprising means for determining the longitudinal and/or transverse displacement velocity of the first moving element, said processing means, connected to the additional detection means, comprising means for determining, by optical triangulation, the distance between the device and the other element, in a plane perpendicular to said displacement plane, and correction means for determining corrected values of the longitudinal and/or transverse displacement velocity according to said distance and to the values supplied by the means for determining the longitudinal and/or transverse displacement velocity of the moving element.