Patent ID: 9612144
Date: 2017-04-04
CPC Classifications: G01F,G01P

Claim:
1. A method for measuring a flow rate of optically non-homogeneous material in a process pipe, the method comprising: illuminating a measuring area of the optically non-homogeneous material in the process pipe, through a window in the process pipe that is in contact with the non-homogeneous material, with a light source; imaging with a camera, through the same window in the process pipe, illuminated non-homogeneous material in the process pipe wherein the camera and the light source are arranged on a same side of the process pipe; determining through correlation between temporally successive images, travel performed by the non-homogeneous material in the process pipe between capture of temporally successive images; and determining a velocity of the non-homogeneous material in the process pipe by a time difference between the successive images and the travel.