Patent ID: 7842913
Filing Date: 2010-11-30
Classification: G01D

Abstract:
1. A device for measuring the position of a first component in relative motion with respect to a second component, said device comprising: at least one diffractive support including mounting means carried by a first component in relative motion with respect to a second component, and at least one diffractive track; at least one fixed light source, emitting at least one light beam onto said at least one diffractive support; means for detecting and reading an optical signal obtained by diffraction of the light beam(s) by transmission or reflection from the diffractive support(s), wherein said optical signal contains information indicative of its quality; and means for processing optical code resulting from the detected signal allowing the position of the diffractive support(s) relatively to the beam(s) and the reliability of the position information to be determined, wherein said diffractive track has means diffracting the light beam emitted by said at least one light source fixed relatively to the second component, and wherein said diffractive track contains information indicative of its quality.