Patent ID: 9035232
Filing Date: 2015-05-19
Classification: G01D

Abstract:
1. A method for determining at least the eccentricity of a rotating element which is mounted in a fixed frame, said method comprising: using at least one fixed light source emitting a light beam in the direction of a fixed sensor; arranging the light source with respect to the rotating element and with respect to the sensor in a way so as to induce an interaction between the light beam and the sensor, which depends on the angular position and the radial position of the rotating element; using computing and processing means for providing a value of the radial position dependent on the output signal of the sensor; arranging on the path of the light beam a code-disc which comprises a two dimensional regular pattern interlaced with an absolute code and which is integral in rotation with the rotating element; and using an image cast by said code-disc on the sensor for determining the eccentricity of the code-disc dependent on the angular position of the rotating element.