A method for measuring a dimensional deviation of a ball and ball - measuring device therefor

摘要

1. A method for measuring a dimensional deviation of a ball (14), comprising the steps of: (a) directing a first laser beam (22) of an interferometer - device (16) to a first point on the spherical surface (o) of the ball (14), (b) directing a second laser beam (24) of the interferometer - device (16) to a second point on the spherical surface (o) of the ball (14), (c) rotation of the ball (14) about its centre and (d) calculating the change in diameter as the sum of the changes in a first path length (w1) of the first laser beam (22) and a second path length (w2) of the second laser beam (24), (e) wherein the first laser beam (22) and the second laser beam (24) propagate collinearly and in the direction toward the center of the ball (14) to extend.