Patent ID: 6778286
Filing Date: 2004-08-17
Classification: G01B

Abstract:
An apparatus for measuring distortion of a cylindrical body, comprising:a stationary straight rail provided on a flat surface; a cylindrical-body transfer mechanism for rolling the cylindrical body, the cylindrical body having an axis which is perpendicular to the flat surface and rolling such that a peripheral surface of one end of the cylindrical body remains in contact with the stationary straight rail; a reference pole disposed at a position separated a predetermined distance from the cylindrical body in a direction perpendicular to the rolling direction of the cylindrical body; a laser scan micrometer for simultaneously scanning the other end of the cylindrical body and the reference pole by means of laser beam projected toward the rolling direction to thereby measure a distance between the cylindrical body and the reference pole; and a control section for controlling the cylindrical-body transfer mechanism and the laser scan micrometer and for processing measurement data output from the laser scan micrometer to thereby obtain a radial distortion of the cylindrical body.