Patent ID: 8102540
Filing Date: 2012-01-24
Classification: G01F

Abstract:
1. A Coriolis flow sensor with a vibrating flow tube through which a medium flows, which flow sensor comprises exciting means for exciting the tube, and optical detection means for determining the movements of at least one point of the tube, said optical detection means comprising a light source for having a light beam incident at the tube wall, at a layer provided on this wall, or at an element attached to this wall, and a light sensor having a photosensitive surface for sensing the light of the light beam after reflection against the tube wall, a layer provided on this wall, or an element attached to this wall, characterized in that means for shaping the beam are arranged for making the convergence of the beam in the direction of movement of the tube associated with the Coriolis forces smaller than the convergence in the direction of movement of the tube associated with the excitation forces.