Patent ID: 8037615

Claim:
Process for determining the alignment of two rotatable machine parts with a first measurement unit with a light source for emitting a light beam which has been expanded in one plane, and a second measurement unit with an optical detector unit which comprises two linear sensors which are arranged parallel to one another, comprising the steps of: mounting the first measurement unit on a first of the machine parts and the second measurement unit on a second of the machine parts, emitting a light beam which is parallel to a longitudinal axis of the first machine part so as to be incident on the detector unit, said light beam being expanded fan-shaped in a plane transverse to said longitudinal axis and running tangentially to a circle around the axis of rotation, evaluating the points of incidence of the light beam which has been produced by the two-dimensionally expanded light beam on the two linear sensors which are arranged parallel to one another in a direction orthogonal to said longitudinal axis and crosswise of the direction of expansion of the light beam so that the points of incidence of the expanded light beam produced on the line sensors intersect the two linear sensors in a middle area thereof and then migrate along the linear sensors during rotation of the light source relative to the detector unit, and determining misalignment of the axes of the machine parts relative to one another based on the evaluation of the points of incidence of the light pattern.