Detection of Central Position of Rotating Work by Laser Doppler Velocimetry

Abstract

A new method to determine the central position of a rotating object is described. The principle is based on the fact that the tangential velocity of rotation becomes zero in the central position. Therefore, the velocity of several points along each Cartesian coordinate axis of the object is evaluated with a laser Doppler velocimetry. The central position is determined by straight line approximation in the method of least squares. From the experimental results, it is disclosed that by this method, the central position is determined with an accuracy of 1-2μm.